Search a number
-
+
122212121 = 1011210021
BaseRepresentation
bin1110100100011…
…00111100011001
322111222000111212
413102030330121
5222241241441
620043232505
73012533363
oct722147431
9274860455
10122212121
1162a92859
1234b18735
131c41ca85
1412333d33
15aae0eeb
hex748cf19

122212121 has 4 divisors (see below), whose sum is σ = 123422244. Its totient is φ = 121002000.

The previous prime is 122212093. The next prime is 122212141. The reversal of 122212121 is 121212221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114169225 + 8042896 = 10685^2 + 2836^2 .

It is a cyclic number.

It is not a de Polignac number, because 122212121 - 218 = 121949977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122212096 and 122212105.

It is not an unprimeable number, because it can be changed into a prime (122212141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 604910 + ... + 605111.

It is an arithmetic number, because the mean of its divisors is an integer number (30855561).

Almost surely, 2122212121 is an apocalyptic number.

It is an amenable number.

122212121 is a deficient number, since it is larger than the sum of its proper divisors (1210123).

122212121 is a wasteful number, since it uses less digits than its factorization.

122212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210122.

The product of its digits is 32, while the sum is 14.

The square root of 122212121 is about 11054.9591134477. The cubic root of 122212121 is about 496.2548456785.

Adding to 122212121 its reverse (121212221), we get a palindrome (243424342).

The spelling of 122212121 in words is "one hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".

Divisors: 1 101 1210021 122212121