55221502131 has 24 divisors (see below), whose sum is σ = 83991186240. Its totient is φ = 34864830000.

The previous prime is 55221502123. The next prime is 55221502139. The reversal of 55221502131 is 13120512255.

55221502131 is a `hidden beast` number, since 5 + 5 + 2 + 21 + 502 + 131 = 666.

It is an interprime number because it is at equal distance from previous prime (55221502123) and next prime (55221502139).

It is not a de Polignac number, because 55221502131 - 2³ = 55221502123 is a prime.

It is a super-2 number, since 2×55221502131² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55221502095 and 55221502104.

It is not an unprimeable number, because it can be changed into a prime (55221502139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 461256 + ... + 568506.

It is an arithmetic number, because the mean of its divisors is an integer number (3499632760).

Almost surely, 2^55221502131 is an apocalyptic number.

55221502131 is a deficient number, since it is larger than the sum of its proper divisors (28769684109).

55221502131 is a wasteful number, since it uses less digits than its factorization.

55221502131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110287 (or 110284 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 55221502131 in words is "fifty-five billion, two hundred twenty-one million, five hundred two thousand, one hundred thirty-one".