21549364 has 12 divisors (see below), whose sum is σ = 38588704. Its totient is φ = 10524024.

The previous prime is 21549301. The next prime is 21549389. The reversal of 21549364 is 46394512.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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, 62472 + ... + 62815.

Almost surely, 2^21549364 is an apocalyptic number.

It is an amenable number.

21549364 is a deficient number, since it is larger than the sum of its proper divisors (17039340).

21549364 is a wasteful number, since it uses less digits than its factorization.

21549364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125334 (or 125332 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 21549364 is about 4642.1292528322. The cubic root of 21549364 is about 278.2775379890.

The spelling of 21549364 in words is "twenty-one million, five hundred forty-nine thousand, three hundred sixty-four".