| Base | Representation |
|---|---|
| bin | 100100011011001… |
| … | …1110111110101101 |
| 3 | 10011011212100010102 |
| 4 | 1020312132332231 |
| 5 | 10000343222341 |
| 6 | 321140520445 |
| 7 | 42200613254 |
| oct | 11066367655 |
| 9 | 3134770112 |
| 10 | 1222242221 |
| 11 | 577a18742 |
| 12 | 2a13b0125 |
| 13 | 1662b1365 |
| 14 | b847d79b |
| 15 | 72480c9b |
| hex | 48d9efad |
1222242221 has 4 divisors (see below), whose sum is σ = 1222318944. Its totient is φ = 1222165500.
The previous prime is 1222242211. The next prime is 1222242227. The reversal of 1222242221 is 1222422221.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1222422221 = 79 ⋅15473699.
It is a cyclic number.
It is not a de Polignac number, because 1222242221 - 222 = 1218047917 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 1222242193 and 1222242202.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1222242227) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4505 + ... + 49646.
It is an arithmetic number, because the mean of its divisors is an integer number (305579736).
Almost surely, 21222242221 is an apocalyptic number.
It is an amenable number.
1222242221 is a deficient number, since it is larger than the sum of its proper divisors (76723).
1222242221 is an equidigital number, since it uses as much as digits as its factorization.
1222242221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 76722.
The product of its digits is 512, while the sum is 20.
The square root of 1222242221 is about 34960.5809591317. The cubic root of 1222242221 is about 1069.1839414910.
Adding to 1222242221 its reverse (1222422221), we get a palindrome (2444664442).
It can be divided in two parts, 1 and 222242221, that added together give a palindrome (222242222).
The spelling of 1222242221 in words is "one billion, two hundred twenty-two million, two hundred forty-two thousand, two hundred twenty-one".
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