21294872 has 16 divisors (see below), whose sum is σ = 41664240. Its totient is φ = 10184416.

The previous prime is 21294859. The next prime is 21294881. The reversal of 21294872 is 27849212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57683 + ... + 58050.

It is an arithmetic number, because the mean of its divisors is an integer number (2604015).

Almost surely, 2^21294872 is an apocalyptic number.

It is an amenable number.

21294872 is a deficient number, since it is larger than the sum of its proper divisors (20369368).

21294872 is a wasteful number, since it uses less digits than its factorization.

21294872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115762 (or 115758 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 21294872 is about 4614.6367137620. The cubic root of 21294872 is about 277.1777369823.

The spelling of 21294872 in words is "twenty-one million, two hundred ninety-four thousand, eight hundred seventy-two".