21362884 has 9 divisors (see below), whose sum is σ = 37401231. Its totient is φ = 10676820.

The previous prime is 21362881. The next prime is 21362893. The reversal of 21362884 is 48826312.

The square root of 21362884 is 4622.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21362881) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8089 + ... + 10399.

Almost surely, 2^21362884 is an apocalyptic number.

21362884 is the 4622-nd square number.

It is an amenable number.

21362884 is a deficient number, since it is larger than the sum of its proper divisors (16038347).

21362884 is an frugal number, since it uses more digits than its factorization.

21362884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4626 (or 2313 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The cubic root of 21362884 is about 277.4725087069.

The spelling of 21362884 in words is "twenty-one million, three hundred sixty-two thousand, eight hundred eighty-four".