21325975 has 12 divisors (see below), whose sum is σ = 28848600. Its totient is φ = 15509600.

The previous prime is 21325957. The next prime is 21326017. The reversal of 21325975 is 57952312.

It is not a de Polignac number, because 21325975 - 2⁵ = 21325943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21325975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38500 + ... + 39049.

It is an arithmetic number, because the mean of its divisors is an integer number (2404050).

Almost surely, 2^21325975 is an apocalyptic number.

21325975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21325975 is a deficient number, since it is larger than the sum of its proper divisors (7522625).

21325975 is a wasteful number, since it uses less digits than its factorization.

21325975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77570 (or 77565 counting only the distinct ones).

The product of its digits is 18900, while the sum is 34.

The square root of 21325975 is about 4618.0055218676. The cubic root of 21325975 is about 277.3126186772.

The spelling of 21325975 in words is "twenty-one million, three hundred twenty-five thousand, nine hundred seventy-five".