Base | Representation |
---|---|
bin | 10001110001001111111… |
… | …001001101100111101001 |
3 | 11022201220022222121202220 |
4 | 101301033321031213221 |
5 | 130001313421010441 |
6 | 2332545400544253 |
7 | 154136162115030 |
oct | 21611771154751 |
9 | 4281808877686 |
10 | 1221111110121 |
11 | 430963429641 |
12 | 1787ab782089 |
13 | 8b1c5233246 |
14 | 43160201717 |
15 | 21b6d284466 |
hex | 11c4fe4d9e9 |
1221111110121 has 16 divisors (see below), whose sum is σ = 1863489270144. Its totient is φ = 696747078144.
The previous prime is 1221111110071. The next prime is 1221111110123. The reversal of 1221111110121 is 1210111111221.
It is not a de Polignac number, because 1221111110121 - 211 = 1221111108073 is a prime.
It is a super-2 number, since 2×12211111101212 (a number of 25 digits) contains 22 as substring.
It is a self number, because there is not a number n which added to its sum of digits gives 1221111110121.
It is not an unprimeable number, because it can be changed into a prime (1221111110123) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42931240 + ... + 42959673.
It is an arithmetic number, because the mean of its divisors is an integer number (116468079384).
Almost surely, 21221111110121 is an apocalyptic number.
It is an amenable number.
1221111110121 is a deficient number, since it is larger than the sum of its proper divisors (642378160023).
1221111110121 is an equidigital number, since it uses as much as digits as its factorization.
1221111110121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 85891600.
The product of its (nonzero) digits is 8, while the sum is 15.
Adding to 1221111110121 its reverse (1210111111221), we get a palindrome (2431222221342).
It can be divided in two parts, 1221111 and 110121, that multiplied together give a palindrome (134469964431).
The spelling of 1221111110121 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, one hundred twenty-one".
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