55856122921 has 3 divisors (see below), whose sum is σ = 55856359261. Its totient is φ = 55855886582.

The previous prime is 55856122919. The next prime is 55856122951. The reversal of 55856122921 is 12922165855.

The square root of 55856122921 is 236339.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 55856122921 - 2¹ = 55856122919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55856122951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 118170 + ... + 354508.

Almost surely, 2^55856122921 is an apocalyptic number.

55856122921 is the 236339-th square number.

55856122921 is the 118170-th centered octagonal number.

It is an amenable number.

55856122921 is a deficient number, since it is larger than the sum of its proper divisors (236340).

55856122921 is an frugal number, since it uses more digits than its factorization.

55856122921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472678 (or 236339 counting only the distinct ones).

The product of its digits is 432000, while the sum is 46.

The spelling of 55856122921 in words is "fifty-five billion, eight hundred fifty-six million, one hundred twenty-two thousand, nine hundred twenty-one".