21525507370 has 16 divisors (see below), whose sum is σ = 39381093288. Its totient is φ = 8469051840.

The previous prime is 21525507331. The next prime is 21525507391. The reversal of 21525507370 is 7370552512.

21525507370 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 15403540321 + 6121967049 = 124111^2 + 78243^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17643249 + ... + 17644468.

Almost surely, 2^21525507370 is an apocalyptic number.

21525507370 is a deficient number, since it is larger than the sum of its proper divisors (17855585918).

21525507370 is a wasteful number, since it uses less digits than its factorization.

21525507370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35287785.

The product of its (nonzero) digits is 73500, while the sum is 37.

The spelling of 21525507370 in words is "twenty-one billion, five hundred twenty-five million, five hundred seven thousand, three hundred seventy".