21377472 has 28 divisors (see below), whose sum is σ = 56561736. Its totient is φ = 7125760.

The previous prime is 21377459. The next prime is 21377501. The reversal of 21377472 is 27477312.

It is a super-2 number, since 2×21377472² = 913992618221568, which contains 22 as substring.

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, 55479 + ... + 55862.

It is an arithmetic number, because the mean of its divisors is an integer number (2020062).

Almost surely, 2^21377472 is an apocalyptic number.

It is an amenable number.

21377472 is an abundant number, since it is smaller than the sum of its proper divisors (35184264).

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

21377472 is a wasteful number, since it uses less digits than its factorization.

21377472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111356 (or 111346 counting only the distinct ones).

The product of its digits is 16464, while the sum is 33.

The square root of 21377472 is about 4623.5778353998. The cubic root of 21377472 is about 277.5356532391.

The spelling of 21377472 in words is "twenty-one million, three hundred seventy-seven thousand, four hundred seventy-two".