21725562 has 16 divisors (see below), whose sum is σ = 44376192. Its totient is φ = 7087680.

The previous prime is 21725551. The next prime is 21725567. The reversal of 21725562 is 26552712.

It is not an unprimeable number, because it can be changed into a prime (21725567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38239 + ... + 38802.

It is an arithmetic number, because the mean of its divisors is an integer number (2773512).

Almost surely, 2^21725562 is an apocalyptic number.

21725562 is an abundant number, since it is smaller than the sum of its proper divisors (22650630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21725562 is a wasteful number, since it uses less digits than its factorization.

21725562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77093.

The product of its digits is 8400, while the sum is 30.

The square root of 21725562 is about 4661.0687615610. The cubic root of 21725562 is about 279.0339240105.

The spelling of 21725562 in words is "twenty-one million, seven hundred twenty-five thousand, five hundred sixty-two".