21493468 has 12 divisors (see below), whose sum is σ = 37665040. Its totient is φ = 10732032.

The previous prime is 21493453. The next prime is 21493481. The reversal of 21493468 is 86439412.

It is a hoax number, since the sum of its digits (37) 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, 28 + ... + 6556.

Almost surely, 2^21493468 is an apocalyptic number.

It is an amenable number.

21493468 is a deficient number, since it is larger than the sum of its proper divisors (16171572).

21493468 is a wasteful number, since it uses less digits than its factorization.

21493468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7356 (or 7354 counting only the distinct ones).

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

The square root of 21493468 is about 4636.1048305663. The cubic root of 21493468 is about 278.0367254761.

The spelling of 21493468 in words is "twenty-one million, four hundred ninety-three thousand, four hundred sixty-eight".