21513025010 has 16 divisors (see below), whose sum is σ = 38726902872. Its totient is φ = 8604441600.

The previous prime is 21513024997. The next prime is 21513025031. The reversal of 21513025010 is 1052031512.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7988963161 + 13524061849 = 89381^2 + 116293^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29330 + ... + 209490.

Almost surely, 2^21513025010 is an apocalyptic number.

21513025010 is a deficient number, since it is larger than the sum of its proper divisors (17213877862).

21513025010 is a wasteful number, since it uses less digits than its factorization.

21513025010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192109.

The product of its (nonzero) digits is 300, while the sum is 20.

Adding to 21513025010 its reverse (1052031512), we get a palindrome (22565056522).

The spelling of 21513025010 in words is "twenty-one billion, five hundred thirteen million, twenty-five thousand, ten".