21052313525 has 12 divisors (see below), whose sum is σ = 26165450304. Its totient is φ = 16802766000.

The previous prime is 21052313483. The next prime is 21052313537. The reversal of 21052313525 is 52531325012.

It is not a de Polignac number, because 21052313525 - 2²⁸ = 20783878069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 966131 + ... + 987680.

It is an arithmetic number, because the mean of its divisors is an integer number (2180454192).

Almost surely, 2^21052313525 is an apocalyptic number.

21052313525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21052313525 is a deficient number, since it is larger than the sum of its proper divisors (5113136779).

21052313525 is a wasteful number, since it uses less digits than its factorization.

21052313525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954252 (or 1954247 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 21052313525 its reverse (52531325012), we get a palindrome (73583638537).

The spelling of 21052313525 in words is "twenty-one billion, fifty-two million, three hundred thirteen thousand, five hundred twenty-five".