21725895 has 16 divisors (see below), whose sum is σ = 35239392. Its totient is φ = 11427840.

The previous prime is 21725863. The next prime is 21725897. The reversal of 21725895 is 59852712.

It is not a de Polignac number, because 21725895 - 2⁵ = 21725863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21725897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8826 + ... + 11015.

It is an arithmetic number, because the mean of its divisors is an integer number (2202462).

Almost surely, 2^21725895 is an apocalyptic number.

21725895 is a deficient number, since it is larger than the sum of its proper divisors (13513497).

21725895 is a wasteful number, since it uses less digits than its factorization.

21725895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19922.

The product of its digits is 50400, while the sum is 39.

The square root of 21725895 is about 4661.1044828452. The cubic root of 21725895 is about 279.0353496403.

The spelling of 21725895 in words is "twenty-one million, seven hundred twenty-five thousand, eight hundred ninety-five".