21894364 has 18 divisors (see below), whose sum is σ = 38980032. Its totient is φ = 10760400.

The previous prime is 21894347. The next prime is 21894371. The reversal of 21894364 is 46349812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14149 + ... + 15619.

Almost surely, 2^21894364 is an apocalyptic number.

It is an amenable number.

21894364 is a deficient number, since it is larger than the sum of its proper divisors (17085668).

21894364 is a wasteful number, since it uses less digits than its factorization.

21894364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597 (or 1534 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 21894364 is about 4679.1413742267. The cubic root of 21894364 is about 279.7547342019.

The spelling of 21894364 in words is "twenty-one million, eight hundred ninety-four thousand, three hundred sixty-four".