21268572 has 24 divisors (see below), whose sum is σ = 53444496. Its totient is φ = 6544128.

The previous prime is 21268567. The next prime is 21268579. The reversal of 21268572 is 27586212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21268579) 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, 68013 + ... + 68324.

It is an arithmetic number, because the mean of its divisors is an integer number (2226854).

Almost surely, 2^21268572 is an apocalyptic number.

It is an amenable number.

21268572 is an abundant number, since it is smaller than the sum of its proper divisors (32175924).

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

21268572 is a wasteful number, since it uses less digits than its factorization.

21268572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136357 (or 136355 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 21268572 is about 4611.7862049319. The cubic root of 21268572 is about 277.0635815243.

The spelling of 21268572 in words is "twenty-one million, two hundred sixty-eight thousand, five hundred seventy-two".