21887468 has 24 divisors (see below), whose sum is σ = 40748400. Its totient is φ = 10257408.

The previous prime is 21887447. The next prime is 21887479. The reversal of 21887468 is 86478812.

It is a super-2 number, since 2×21887468² = 958122510902048, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5888 + ... + 8856.

It is an arithmetic number, because the mean of its divisors is an integer number (1697850).

Almost surely, 2^21887468 is an apocalyptic number.

It is an amenable number.

21887468 is a deficient number, since it is larger than the sum of its proper divisors (18860932).

21887468 is a wasteful number, since it uses less digits than its factorization.

21887468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089 (or 3087 counting only the distinct ones).

The product of its digits is 172032, while the sum is 44.

The square root of 21887468 is about 4678.4044288625. The cubic root of 21887468 is about 279.7253599571.

The spelling of 21887468 in words is "twenty-one million, eight hundred eighty-seven thousand, four hundred sixty-eight".