21155002552125 has 192 divisors, whose sum is σ = 42525092413440. Its totient is φ = 10046170713600.

The previous prime is 21155002552039. The next prime is 21155002552133. The reversal of 21155002552125 is 52125520055112.

21155002552125 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 500 + 25 + 5 + 2 + 125 = 666.

It is not a de Polignac number, because 21155002552125 - 2⁷ = 21155002551997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21155002552125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 461000932 + ... + 461046818.

It is an arithmetic number, because the mean of its divisors is an integer number (221484856320).

Almost surely, 2^{21155002552125} is an apocalyptic number.

21155002552125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21155002552125 is an abundant number, since it is smaller than the sum of its proper divisors (21370089861315).

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

21155002552125 is a wasteful number, since it uses less digits than its factorization.

21155002552125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47037 (or 47024 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 36.

The spelling of 21155002552125 in words is "twenty-one trillion, one hundred fifty-five billion, two million, five hundred fifty-two thousand, one hundred twenty-five".