21575270525 has 12 divisors (see below), whose sum is σ = 26787353952. Its totient is φ = 17238269040.

The previous prime is 21575270513. The next prime is 21575270527. The reversal of 21575270525 is 52507257512.

It is not a de Polignac number, because 21575270525 - 2³⁰ = 20501528701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21575270527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 528617 + ... + 567966.

It is an arithmetic number, because the mean of its divisors is an integer number (2232279496).

Almost surely, 2^21575270525 is an apocalyptic number.

21575270525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21575270525 is a deficient number, since it is larger than the sum of its proper divisors (5212083427).

21575270525 is a wasteful number, since it uses less digits than its factorization.

21575270525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097380 (or 1097375 counting only the distinct ones).

The product of its (nonzero) digits is 245000, while the sum is 41.

The spelling of 21575270525 in words is "twenty-one billion, five hundred seventy-five million, two hundred seventy thousand, five hundred twenty-five".