21493488 has 40 divisors (see below), whose sum is σ = 55831248. Its totient is φ = 7124992.

The previous prime is 21493487. The next prime is 21493489. The reversal of 21493488 is 88439412.

It is an interprime number because it is at equal distance from previous prime (21493487) and next prime (21493489).

It is a super-2 number, since 2×21493488² = 923940052812288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21493481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8320 + ... + 10592.

Almost surely, 2^21493488 is an apocalyptic number.

It is an amenable number.

21493488 is an abundant number, since it is smaller than the sum of its proper divisors (34337760).

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

21493488 is a wasteful number, since it uses less digits than its factorization.

21493488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481 (or 2475 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 21493488 is about 4636.1069875489. The cubic root of 21493488 is about 278.0368117152.

The spelling of 21493488 in words is "twenty-one million, four hundred ninety-three thousand, four hundred eighty-eight".