21155002552124 has 48 divisors (see below), whose sum is σ = 42331385376000. Its totient is φ = 9061849399680.

The previous prime is 21155002552039. The next prime is 21155002552133. The reversal of 21155002552124 is 42125520055112.

It is a super-2 number, since 2×21155002552124² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 500321864 + ... + 500364144.

It is an arithmetic number, because the mean of its divisors is an integer number (881903862000).

Almost surely, 2^{21155002552124} is an apocalyptic number.

It is an amenable number.

21155002552124 is an abundant number, since it is smaller than the sum of its proper divisors (21176382823876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21155002552124 is a wasteful number, since it uses less digits than its factorization.

21155002552124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50898 (or 50896 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 35.

The spelling of 21155002552124 in words is "twenty-one trillion, one hundred fifty-five billion, two million, five hundred fifty-two thousand, one hundred twenty-four".