121556225631 has 16 divisors (see below), whose sum is σ = 169560534528. Its totient is φ = 77378808000.

The previous prime is 121556225627. The next prime is 121556225633. The reversal of 121556225631 is 136522655121.

It is not a de Polignac number, because 121556225631 - 2² = 121556225627 is a prime.

It is a super-2 number, since 2×121556225631² (a number of 23 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 121556225631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121556225633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10507645 + ... + 10519206.

It is an arithmetic number, because the mean of its divisors is an integer number (10597533408).

Almost surely, 2^121556225631 is an apocalyptic number.

121556225631 is a deficient number, since it is larger than the sum of its proper divisors (48004308897).

121556225631 is a wasteful number, since it uses less digits than its factorization.

121556225631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21026942.

The product of its digits is 108000, while the sum is 39.

The spelling of 121556225631 in words is "one hundred twenty-one billion, five hundred fifty-six million, two hundred twenty-five thousand, six hundred thirty-one".