21022911325 has 18 divisors (see below), whose sum is σ = 28227928974. Its totient is φ = 15524608320.

The previous prime is 21022911313. The next prime is 21022911347. The reversal of 21022911325 is 52311922012.

It can be written as a sum of positive squares in 9 ways, for example, as 6142327129 + 14880584196 = 78373^2 + 121986^2 .

It is not a de Polignac number, because 21022911325 - 2⁵ = 21022911293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022911293 and 21022911302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2483694 + ... + 2492143.

Almost surely, 2^21022911325 is an apocalyptic number.

21022911325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21022911325 is a deficient number, since it is larger than the sum of its proper divisors (7205017649).

21022911325 is a wasteful number, since it uses less digits than its factorization.

21022911325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4975873 (or 4975855 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 21022911325 in words is "twenty-one billion, twenty-two million, nine hundred eleven thousand, three hundred twenty-five".