21295825 has 12 divisors (see below), whose sum is σ = 26588700. Its totient is φ = 16919360.

The previous prime is 21295819. The next prime is 21295829. The reversal of 21295825 is 52859212.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2085136 + 19210689 = 1444^2 + 4383^2 .

It is not a de Polignac number, because 21295825 - 2³ = 21295817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21295829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 867 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (2215725).

Almost surely, 2^21295825 is an apocalyptic number.

21295825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21295825 is a deficient number, since it is larger than the sum of its proper divisors (5292875).

21295825 is a wasteful number, since it uses less digits than its factorization.

21295825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5876 (or 5871 counting only the distinct ones).

The product of its digits is 14400, while the sum is 34.

The square root of 21295825 is about 4614.7399710060. The cubic root of 21295825 is about 277.1818717248.

The spelling of 21295825 in words is "twenty-one million, two hundred ninety-five thousand, eight hundred twenty-five".