121653790881 has 32 divisors (see below), whose sum is σ = 198441292800. Its totient is φ = 64741446720.

The previous prime is 121653790781. The next prime is 121653790889. The reversal of 121653790881 is 188097356121.

It is not a de Polignac number, because 121653790881 - 2¹⁰ = 121653789857 is a prime.

It is a super-2 number, since 2×121653790881² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121653790889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2560330 + ... + 2607411.

It is an arithmetic number, because the mean of its divisors is an integer number (6201290400).

Almost surely, 2^121653790881 is an apocalyptic number.

It is an amenable number.

121653790881 is a deficient number, since it is larger than the sum of its proper divisors (76787501919).

121653790881 is a wasteful number, since it uses less digits than its factorization.

121653790881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5167829.

The product of its (nonzero) digits is 725760, while the sum is 51.

The spelling of 121653790881 in words is "one hundred twenty-one billion, six hundred fifty-three million, seven hundred ninety thousand, eight hundred eighty-one".