21152525025 has 12 divisors (see below), whose sum is σ = 34972174832. Its totient is φ = 11281346640.

The previous prime is 21152525003. The next prime is 21152525033. The reversal of 21152525025 is 52052525112.

It is not a de Polignac number, because 21152525025 - 2⁵ = 21152524993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21152524983 and 21152525001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141016759 + ... + 141016908.

Almost surely, 2^21152525025 is an apocalyptic number.

21152525025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21152525025 is a deficient number, since it is larger than the sum of its proper divisors (13819649807).

21152525025 is a wasteful number, since it uses less digits than its factorization.

21152525025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282033680 (or 282033675 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The spelling of 21152525025 in words is "twenty-one billion, one hundred fifty-two million, five hundred twenty-five thousand, twenty-five".