12656226121 has 12 divisors (see below), whose sum is σ = 16060962960. Its totient is φ = 9861993960.

The previous prime is 12656226083. The next prime is 12656226131. The reversal of 12656226121 is 12162265621.

It is not a de Polignac number, because 12656226121 - 2⁷ = 12656225993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12656226131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11739931 + ... + 11741008.

It is an arithmetic number, because the mean of its divisors is an integer number (1338413580).

Almost surely, 2^12656226121 is an apocalyptic number.

12656226121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12656226121 is a deficient number, since it is larger than the sum of its proper divisors (3404736839).

12656226121 is a wasteful number, since it uses less digits than its factorization.

12656226121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23480964 (or 23480957 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The spelling of 12656226121 in words is "twelve billion, six hundred fifty-six million, two hundred twenty-six thousand, one hundred twenty-one".