21376925 has 12 divisors (see below), whose sum is σ = 26578656. Its totient is φ = 17055600.

The previous prime is 21376907. The next prime is 21376931. The reversal of 21376925 is 52967312.

It is not a de Polignac number, because 21376925 - 2²⁰ = 20328349 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, 10760 + ... + 12590.

It is an arithmetic number, because the mean of its divisors is an integer number (2214888).

Almost surely, 2^21376925 is an apocalyptic number.

21376925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21376925 is a deficient number, since it is larger than the sum of its proper divisors (5201731).

21376925 is a wasteful number, since it uses less digits than its factorization.

21376925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308 (or 2303 counting only the distinct ones).

The product of its digits is 22680, while the sum is 35.

The square root of 21376925 is about 4623.5186816969. The cubic root of 21376925 is about 277.5332860540.

The spelling of 21376925 in words is "twenty-one million, three hundred seventy-six thousand, nine hundred twenty-five".