21894264 has 48 divisors (see below), whose sum is σ = 67769520. Its totient is φ = 6255360.

The previous prime is 21894259. The next prime is 21894281. The reversal of 21894264 is 46249812.

It is a super-2 number, since 2×21894264² = 958717592203392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21217 + ... + 22224.

It is an arithmetic number, because the mean of its divisors is an integer number (1411865).

Almost surely, 2^21894264 is an apocalyptic number.

21894264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21894264 is an abundant number, since it is smaller than the sum of its proper divisors (45875256).

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

21894264 is a wasteful number, since it uses less digits than its factorization.

21894264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43460 (or 43453 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 21894264 is about 4679.1306884933. The cubic root of 21894264 is about 279.7543082854.

The spelling of 21894264 in words is "twenty-one million, eight hundred ninety-four thousand, two hundred sixty-four".