21525170468 has 12 divisors (see below), whose sum is σ = 38687130972. Its totient is φ = 10471704480.

The previous prime is 21525170413. The next prime is 21525170479. The reversal of 21525170468 is 86407152512.

It can be written as a sum of positive squares in 2 ways, for example, as 8625208384 + 12899962084 = 92872^2 + 113578^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72720023 + ... + 72720318.

It is an arithmetic number, because the mean of its divisors is an integer number (3223927581).

Almost surely, 2^21525170468 is an apocalyptic number.

It is an amenable number.

21525170468 is a deficient number, since it is larger than the sum of its proper divisors (17161960504).

21525170468 is a wasteful number, since it uses less digits than its factorization.

21525170468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145440382 (or 145440380 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 21525170468 in words is "twenty-one billion, five hundred twenty-five million, one hundred seventy thousand, four hundred sixty-eight".