21540876 has 48 divisors (see below), whose sum is σ = 58033920. Its totient is φ = 6091200.

The previous prime is 21540863. The next prime is 21540901. The reversal of 21540876 is 67804512.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7215 + ... + 9753.

It is an arithmetic number, because the mean of its divisors is an integer number (1209040).

Almost surely, 2^21540876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21540876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29016960).

21540876 is an abundant number, since it is smaller than the sum of its proper divisors (36493044).

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

21540876 is a wasteful number, since it uses less digits than its factorization.

21540876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654 (or 2652 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 21540876 is about 4641.2149271500. The cubic root of 21540876 is about 278.2409966177.

The spelling of 21540876 in words is "twenty-one million, five hundred forty thousand, eight hundred seventy-six".