21525301530025 has 12 divisors (see below), whose sum is σ = 27312103524112. Its totient is φ = 16819770497040.

The previous prime is 21525301530011. The next prime is 21525301530041. The reversal of 21525301530025 is 52003510352512.

It is not a de Polignac number, because 21525301530025 - 2²⁵ = 21525267975593 is a prime.

It is a Duffinian 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, 10011767079 + ... + 10011769228.

Almost surely, 2^{21525301530025} is an apocalyptic number.

21525301530025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21525301530025 is a deficient number, since it is larger than the sum of its proper divisors (5786801994087).

21525301530025 is a wasteful number, since it uses less digits than its factorization.

21525301530025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20023536360 (or 20023536355 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 34.

Adding to 21525301530025 its reverse (52003510352512), we get a palindrome (73528811882537).

The spelling of 21525301530025 in words is "twenty-one trillion, five hundred twenty-five billion, three hundred one million, five hundred thirty thousand, twenty-five".