21732625 has 8 divisors (see below), whose sum is σ = 27122472. Its totient is φ = 17386000.

The previous prime is 21732593. The next prime is 21732661. The reversal of 21732625 is 52623712.

It can be written as a sum of positive squares in 4 ways, for example, as 54289 + 21678336 = 233^2 + 4656^2 .

It is not a de Polignac number, because 21732625 - 2⁵ = 21732593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21732593 and 21732602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86806 + ... + 87055.

It is an arithmetic number, because the mean of its divisors is an integer number (3390309).

Almost surely, 2^21732625 is an apocalyptic number.

21732625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21732625 is a deficient number, since it is larger than the sum of its proper divisors (5389847).

21732625 is an equidigital number, since it uses as much as digits as its factorization.

21732625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173876 (or 173866 counting only the distinct ones).

The product of its digits is 5040, while the sum is 28.

The square root of 21732625 is about 4661.8263588426. The cubic root of 21732625 is about 279.0641587953.

The spelling of 21732625 in words is "twenty-one million, seven hundred thirty-two thousand, six hundred twenty-five".