21713496025 has 27 divisors (see below), whose sum is σ = 29168052861. Its totient is φ = 16027508640.

The previous prime is 21713496017. The next prime is 21713496053. The reversal of 21713496025 is 52069431712.

It is a happy number.

The square root of 21713496025 is 147355.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 5596685721 + 16116810304 = 74811^2 + 126952^2 .

It is not a de Polignac number, because 21713496025 - 2³ = 21713496017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9576942 + ... + 9579208.

Almost surely, 2^21713496025 is an apocalyptic number.

21713496025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21713496025 is the 147355-th square number.

21713496025 is the 73678-th centered octagonal number.

It is an amenable number.

21713496025 is a deficient number, since it is larger than the sum of its proper divisors (7454556836).

21713496025 is an frugal number, since it uses more digits than its factorization.

21713496025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4570 (or 2285 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 21713496025 in words is "twenty-one billion, seven hundred thirteen million, four hundred ninety-six thousand, twenty-five".