21864032 has 12 divisors (see below), whose sum is σ = 43044876. Its totient is φ = 10932000.

The previous prime is 21864019. The next prime is 21864049. The reversal of 21864032 is 23046812.

It is a junction number, because it is equal to n+sod(n) for n = 21863992 and 21864010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341594 + ... + 341657.

It is an arithmetic number, because the mean of its divisors is an integer number (3587073).

Almost surely, 2^21864032 is an apocalyptic number.

It is an amenable number.

21864032 is a deficient number, since it is larger than the sum of its proper divisors (21180844).

21864032 is an equidigital number, since it uses as much as digits as its factorization.

21864032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683261 (or 683253 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21864032 is about 4675.8990579353. The cubic root of 21864032 is about 279.6254856859.

The spelling of 21864032 in words is "twenty-one million, eight hundred sixty-four thousand, thirty-two".