21552025 has 24 divisors (see below), whose sum is σ = 29462400. Its totient is φ = 15508800.

The previous prime is 21552007. The next prime is 21552031. The reversal of 21552025 is 52025512.

It is not a de Polignac number, because 21552025 - 2⁵ = 21551993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21551987 and 21552005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29616 + ... + 30334.

It is an arithmetic number, because the mean of its divisors is an integer number (1227600).

Almost surely, 2^21552025 is an apocalyptic number.

21552025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21552025 is a deficient number, since it is larger than the sum of its proper divisors (7910375).

21552025 is a wasteful number, since it uses less digits than its factorization.

21552025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 21552025 is about 4642.4158581497. The cubic root of 21552025 is about 278.2889917849.

Adding to 21552025 its reverse (52025512), we get a palindrome (73577537).

The spelling of 21552025 in words is "twenty-one million, five hundred fifty-two thousand, twenty-five".