21552625 has 8 divisors (see below), whose sum is σ = 26897832. Its totient is φ = 17242000.

The previous prime is 21552623. The next prime is 21552637. The reversal of 21552625 is 52625512.

It can be written as a sum of positive squares in 4 ways, for example, as 456976 + 21095649 = 676^2 + 4593^2 .

It is not a de Polignac number, because 21552625 - 2¹ = 21552623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21552593 and 21552602.

It is not an unprimeable number, because it can be changed into a prime (21552623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86086 + ... + 86335.

It is an arithmetic number, because the mean of its divisors is an integer number (3362229).

Almost surely, 2^21552625 is an apocalyptic number.

21552625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21552625 is a deficient number, since it is larger than the sum of its proper divisors (5345207).

21552625 is an equidigital number, since it uses as much as digits as its factorization.

21552625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172436 (or 172426 counting only the distinct ones).

The product of its digits is 6000, while the sum is 28.

The square root of 21552625 is about 4642.4804792266. The cubic root of 21552625 is about 278.2915742467.

The spelling of 21552625 in words is "twenty-one million, five hundred fifty-two thousand, six hundred twenty-five".