56557222121 has 4 divisors (see below), whose sum is σ = 56706450000. Its totient is φ = 56407994244.

The previous prime is 56557222109. The next prime is 56557222129. The reversal of 56557222121 is 12122275565.

56557222121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-56557222121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56557222129) 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, 74613371 + ... + 74614128.

It is an arithmetic number, because the mean of its divisors is an integer number (14176612500).

Almost surely, 2^56557222121 is an apocalyptic number.

It is an amenable number.

56557222121 is a deficient number, since it is larger than the sum of its proper divisors (149227879).

56557222121 is a wasteful number, since it uses less digits than its factorization.

56557222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149227878.

The product of its digits is 84000, while the sum is 38.

Adding to 56557222121 its reverse (12122275565), we get a palindrome (68679497686).

The spelling of 56557222121 in words is "fifty-six billion, five hundred fifty-seven million, two hundred twenty-two thousand, one hundred twenty-one".