21052311025 has 12 divisors (see below), whose sum is σ = 26292674800. Its totient is φ = 16720681680.

The previous prime is 21052310989. The next prime is 21052311103. The reversal of 21052311025 is 52011325012.

It is a de Polignac number, because none of the positive numbers 2^k-21052311025 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21052310987 and 21052311005.

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, 3025635 + ... + 3032584.

Almost surely, 2^21052311025 is an apocalyptic number.

21052311025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21052311025 is a deficient number, since it is larger than the sum of its proper divisors (5240363775).

21052311025 is a wasteful number, since it uses less digits than its factorization.

21052311025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6058368 (or 6058363 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 21052311025 its reverse (52011325012), we get a palindrome (73063636037).

The spelling of 21052311025 in words is "twenty-one billion, fifty-two million, three hundred eleven thousand, twenty-five".