12956121 has 12 divisors (see below), whose sum is σ = 18785572. Its totient is φ = 8604576.

The previous prime is 12956117. The next prime is 12956131. The reversal of 12956121 is 12165921.

It can be written as a sum of positive squares in 2 ways, for example, as 3956121 + 9000000 = 1989^2 + 3000^2 .

It is not a de Polignac number, because 12956121 - 2² = 12956117 is a prime.

It is a super-2 number, since 2×12956121² = 335722142733282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12956101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106 + ... + 5091.

Almost surely, 2^12956121 is an apocalyptic number.

It is an amenable number.

12956121 is a deficient number, since it is larger than the sum of its proper divisors (5829451).

12956121 is a wasteful number, since it uses less digits than its factorization.

12956121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5480 (or 5477 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 12956121 is about 3599.4612096812. The cubic root of 12956121 is about 234.8686212990.

The spelling of 12956121 in words is "twelve million, nine hundred fifty-six thousand, one hundred twenty-one".