21320000325 has 144 divisors (see below), whose sum is σ = 43698192720. Its totient is φ = 9858723840.

The previous prime is 21320000309. The next prime is 21320000329. The reversal of 21320000325 is 52300002312.

21320000325 is a `hidden beast` number, since 21 + 320 + 0 + 0 + 0 + 325 = 666.

It can be written as a sum of positive squares in 24 ways, for example, as 17135333604 + 4184666721 = 130902^2 + 64689^2 .

It is not a de Polignac number, because 21320000325 - 2⁴ = 21320000309 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21320000298 and 21320000307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320000329) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3135129 + ... + 3141921.

Almost surely, 2^21320000325 is an apocalyptic number.

21320000325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21320000325 is an abundant number, since it is smaller than the sum of its proper divisors (22378192395).

21320000325 is a wasteful number, since it uses less digits than its factorization.

21320000325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6888 (or 6880 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

Adding to 21320000325 its reverse (52300002312), we get a palindrome (73620002637).

The spelling of 21320000325 in words is "twenty-one billion, three hundred twenty million, three hundred twenty-five", and thus it is an aban number.