21936304 has 40 divisors (see below), whose sum is σ = 46059552. Its totient is φ = 10060800.

The previous prime is 21936293. The next prime is 21936323. The reversal of 21936304 is 40363912.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

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, 54504 + ... + 54904.

Almost surely, 2^21936304 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 21936304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23029776).

21936304 is an abundant number, since it is smaller than the sum of its proper divisors (24123248).

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

21936304 is a wasteful number, since it uses less digits than its factorization.

21936304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 679 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 21936304 is about 4683.6208215439. The cubic root of 21936304 is about 279.9332493944.

The spelling of 21936304 in words is "twenty-one million, nine hundred thirty-six thousand, three hundred four".