21272884 has 24 divisors (see below), whose sum is σ = 39227328. Its totient is φ = 10074240.

The previous prime is 21272843. The next prime is 21272947. The reversal of 21272884 is 48827212.

It is a congruent number.

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, 8764 + ... + 10924.

It is an arithmetic number, because the mean of its divisors is an integer number (1634472).

Almost surely, 2^21272884 is an apocalyptic number.

It is an amenable number.

21272884 is a deficient number, since it is larger than the sum of its proper divisors (17954444).

21272884 is a wasteful number, since it uses less digits than its factorization.

21272884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2295 (or 2293 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 21272884 is about 4612.2536790597. The cubic root of 21272884 is about 277.0823042581.

The spelling of 21272884 in words is "twenty-one million, two hundred seventy-two thousand, eight hundred eighty-four".