21335370925 has 12 divisors (see below), whose sum is σ = 28860938496. Its totient is φ = 15516633200.

The previous prime is 21335370913. The next prime is 21335370989. The reversal of 21335370925 is 52907353312.

It is not a de Polignac number, because 21335370925 - 2⁵ = 21335370893 is a prime.

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, 38791309 + ... + 38791858.

It is an arithmetic number, because the mean of its divisors is an integer number (2405078208).

Almost surely, 2^21335370925 is an apocalyptic number.

21335370925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21335370925 is a deficient number, since it is larger than the sum of its proper divisors (7525567571).

21335370925 is a wasteful number, since it uses less digits than its factorization.

21335370925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77583188 (or 77583183 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 40.

The spelling of 21335370925 in words is "twenty-one billion, three hundred thirty-five million, three hundred seventy thousand, nine hundred twenty-five".