21536200625121 has 48 divisors (see below), whose sum is σ = 38543536012800. Its totient is φ = 11283514151040.

The previous prime is 21536200625117. The next prime is 21536200625153. The reversal of 21536200625121 is 12152600263512.

21536200625121 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 6 + 2 + 0 + 0 + 625 + 1 + 21 = 666.

It is not a de Polignac number, because 21536200625121 - 2² = 21536200625117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21536200625111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88118665 + ... + 88362726.

It is an arithmetic number, because the mean of its divisors is an integer number (802990333600).

Almost surely, 2^{21536200625121} is an apocalyptic number.

21536200625121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21536200625121 is a deficient number, since it is larger than the sum of its proper divisors (17007335387679).

21536200625121 is a wasteful number, since it uses less digits than its factorization.

21536200625121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176481566 (or 176481563 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 21536200625121 its reverse (12152600263512), we get a palindrome (33688800888633).

The spelling of 21536200625121 in words is "twenty-one trillion, five hundred thirty-six billion, two hundred million, six hundred twenty-five thousand, one hundred twenty-one".