121565512057 has 4 divisors (see below), whose sum is σ = 132616922256. Its totient is φ = 110514101860.

The previous prime is 121565511961. The next prime is 121565512099. The reversal of 121565512057 is 750215565121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121565512057 - 2³⁵ = 87205773689 is a prime.

It is a super-2 number, since 2×121565512057² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121565513057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5525705083 + ... + 5525705104.

It is an arithmetic number, because the mean of its divisors is an integer number (33154230564).

Almost surely, 2^121565512057 is an apocalyptic number.

It is an amenable number.

121565512057 is a deficient number, since it is larger than the sum of its proper divisors (11051410199).

121565512057 is a wasteful number, since it uses less digits than its factorization.

121565512057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11051410198.

The product of its (nonzero) digits is 105000, while the sum is 40.

The spelling of 121565512057 in words is "one hundred twenty-one billion, five hundred sixty-five million, five hundred twelve thousand, fifty-seven".