21525170512 has 10 divisors (see below), whose sum is σ = 41705017898. Its totient is φ = 10762585248.

The previous prime is 21525170501. The next prime is 21525170531. The reversal of 21525170512 is 21507152512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19601120016 + 1924050496 = 140004^2 + 43864^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672661563 + ... + 672661594.

Almost surely, 2^21525170512 is an apocalyptic number.

It is an amenable number.

21525170512 is a deficient number, since it is larger than the sum of its proper divisors (20179847386).

21525170512 is a wasteful number, since it uses less digits than its factorization.

21525170512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345323165 (or 1345323159 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 31.

The spelling of 21525170512 in words is "twenty-one billion, five hundred twenty-five million, one hundred seventy thousand, five hundred twelve".