21525003225 has 72 divisors (see below), whose sum is σ = 42235689600. Its totient is φ = 10392412800.

The previous prime is 21525003211. The next prime is 21525003229. The reversal of 21525003225 is 52230052512.

21525003225 is a `hidden beast` number, since 2 + 152 + 500 + 3 + 2 + 2 + 5 = 666.

It is not a de Polignac number, because 21525003225 - 2⁵ = 21525003193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21525003229) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 573331 + ... + 609719.

It is an arithmetic number, because the mean of its divisors is an integer number (586606800).

Almost surely, 2^21525003225 is an apocalyptic number.

21525003225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21525003225 is a deficient number, since it is larger than the sum of its proper divisors (20710686375).

21525003225 is a wasteful number, since it uses less digits than its factorization.

21525003225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36655 (or 36647 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 21525003225 its reverse (52230052512), we get a palindrome (73755055737).

The spelling of 21525003225 in words is "twenty-one billion, five hundred twenty-five million, three thousand, two hundred twenty-five".