21732925 has 6 divisors (see below), whose sum is σ = 26948858. Its totient is φ = 17386320.

The previous prime is 21732917. The next prime is 21732943. The reversal of 21732925 is 52923712.

It can be written as a sum of positive squares in 3 ways, for example, as 101124 + 21631801 = 318^2 + 4651^2 .

It is not a de Polignac number, because 21732925 - 2³ = 21732917 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 5 ways as a sum of consecutive naturals, for example, 434634 + ... + 434683.

Almost surely, 2^21732925 is an apocalyptic number.

21732925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21732925 is a deficient number, since it is larger than the sum of its proper divisors (5215933).

21732925 is an equidigital number, since it uses as much as digits as its factorization.

21732925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869327 (or 869322 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The square root of 21732925 is about 4661.8585349622. The cubic root of 21732925 is about 279.0654428688.

The spelling of 21732925 in words is "twenty-one million, seven hundred thirty-two thousand, nine hundred twenty-five".