21204404325 has 36 divisors (see below), whose sum is σ = 40900945540. Its totient is φ = 10439089920.

The previous prime is 21204404293. The next prime is 21204404357. The reversal of 21204404325 is 52340440212.

21204404325 is a `hidden beast` number, since 21 + 204 + 4 + 0 + 432 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (21204404293) and next prime (21204404357).

It can be written as a sum of positive squares in 6 ways, for example, as 93636 + 21204310689 = 306^2 + 145617^2 .

It is not a de Polignac number, because 21204404325 - 2⁵ = 21204404293 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3621760 + ... + 3627609.

Almost surely, 2^21204404325 is an apocalyptic number.

21204404325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21204404325 is a deficient number, since it is larger than the sum of its proper divisors (19696541215).

21204404325 is a wasteful number, since it uses less digits than its factorization.

21204404325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7249398 (or 7249390 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 21204404325 its reverse (52340440212), we get a palindrome (73544844537).

The spelling of 21204404325 in words is "twenty-one billion, two hundred four million, four hundred four thousand, three hundred twenty-five".