121292031656 has 16 divisors (see below), whose sum is σ = 227443917300. Its totient is φ = 60640320384.

The previous prime is 121292031631. The next prime is 121292031659. The reversal of 121292031656 is 656130292121.

It can be written as a sum of positive squares in 2 ways, for example, as 115865352100 + 5426679556 = 340390^2 + 73666^2 .

It is a super-2 number, since 2×121292031656² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121292031659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620735 + ... + 792398.

Almost surely, 2^121292031656 is an apocalyptic number.

It is an amenable number.

121292031656 is a deficient number, since it is larger than the sum of its proper divisors (106151885644).

121292031656 is a wasteful number, since it uses less digits than its factorization.

121292031656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423868 (or 1423864 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 121292031656 in words is "one hundred twenty-one billion, two hundred ninety-two million, thirty-one thousand, six hundred fifty-six".