21083625 has 32 divisors (see below), whose sum is σ = 38987520. Its totient is φ = 11242800.

The previous prime is 21083611. The next prime is 21083633. The reversal of 21083625 is 52638012.

It is not a de Polignac number, because 21083625 - 2⁵ = 21083593 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 31 ways as a sum of consecutive naturals, for example, 252 + ... + 6498.

It is an arithmetic number, because the mean of its divisors is an integer number (1218360).

Almost surely, 2^21083625 is an apocalyptic number.

21083625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21083625 is a deficient number, since it is larger than the sum of its proper divisors (17903895).

21083625 is an equidigital number, since it uses as much as digits as its factorization.

21083625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6271 (or 6255 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21083625 is about 4591.6908650300. The cubic root of 21083625 is about 276.2581469448.

The spelling of 21083625 in words is "twenty-one million, eighty-three thousand, six hundred twenty-five".