21531433022125 has 24 divisors (see below), whose sum is σ = 29097247361832. Its totient is φ = 15900135139200.

The previous prime is 21531433022117. The next prime is 21531433022137. The reversal of 21531433022125 is 52122033413512.

It can be written as a sum of positive squares in 12 ways, for example, as 21311536739364 + 219896282761 = 4616442^2 + 468931^2 .

It is not a de Polignac number, because 21531433022125 - 2³ = 21531433022117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 509598592 + ... + 509640841.

It is an arithmetic number, because the mean of its divisors is an integer number (1212385306743).

Almost surely, 2^{21531433022125} is an apocalyptic number.

21531433022125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21531433022125 is a deficient number, since it is larger than the sum of its proper divisors (7565814339707).

21531433022125 is a wasteful number, since it uses less digits than its factorization.

21531433022125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019239474 (or 1019239451 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 21531433022125 its reverse (52122033413512), we get a palindrome (73653466435637).

The spelling of 21531433022125 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred thirty-three million, twenty-two thousand, one hundred twenty-five".