21293572 has 12 divisors (see below), whose sum is σ = 37895760. Its totient is φ = 10466216.

The previous prime is 21293563. The next prime is 21293579. The reversal of 21293572 is 27539212.

It is not an unprimeable number, because it can be changed into a prime (21293579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44878 + ... + 45349.

It is an arithmetic number, because the mean of its divisors is an integer number (3157980).

Almost surely, 2^21293572 is an apocalyptic number.

It is an amenable number.

21293572 is a deficient number, since it is larger than the sum of its proper divisors (16602188).

21293572 is a wasteful number, since it uses less digits than its factorization.

21293572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90290 (or 90288 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The square root of 21293572 is about 4614.4958554538. The cubic root of 21293572 is about 277.1720965259.

The spelling of 21293572 in words is "twenty-one million, two hundred ninety-three thousand, five hundred seventy-two".