21267884 has 24 divisors (see below), whose sum is σ = 42992208. Its totient is φ = 9098240.

The previous prime is 21267881. The next prime is 21267887. The reversal of 21267884 is 48876212.

It is an interprime number because it is at equal distance from previous prime (21267881) and next prime (21267887).

It is not an unprimeable number, because it can be changed into a prime (21267881) 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, 13469 + ... + 14964.

It is an arithmetic number, because the mean of its divisors is an integer number (1791342).

Almost surely, 2^21267884 is an apocalyptic number.

It is an amenable number.

21267884 is an abundant number, since it is smaller than the sum of its proper divisors (21724324).

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

21267884 is a wasteful number, since it uses less digits than its factorization.

21267884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28465 (or 28463 counting only the distinct ones).

The product of its digits is 43008, while the sum is 38.

The square root of 21267884 is about 4611.7116128396. The cubic root of 21267884 is about 277.0605939895.

The spelling of 21267884 in words is "twenty-one million, two hundred sixty-seven thousand, eight hundred eighty-four".