21227137325 has 12 divisors (see below), whose sum is σ = 26818286868. Its totient is φ = 16661299200.

The previous prime is 21227137303. The next prime is 21227137357. The reversal of 21227137325 is 52373172212.

It can be written as a sum of positive squares in 6 ways, for example, as 1497844804 + 19729292521 = 38702^2 + 140461^2 .

It is not a de Polignac number, because 21227137325 - 2²⁰ = 21226088749 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent 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, 8008916 + ... + 8011565.

It is an arithmetic number, because the mean of its divisors is an integer number (2234857239).

Almost surely, 2^21227137325 is an apocalyptic number.

21227137325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21227137325 is a deficient number, since it is larger than the sum of its proper divisors (5591149543).

21227137325 is a wasteful number, since it uses less digits than its factorization.

21227137325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16020544 (or 16020539 counting only the distinct ones).

The product of its digits is 35280, while the sum is 35.

The spelling of 21227137325 in words is "twenty-one billion, two hundred twenty-seven million, one hundred thirty-seven thousand, three hundred twenty-five".