21933472 has 24 divisors (see below), whose sum is σ = 47107872. Its totient is φ = 9969600.

The previous prime is 21933449. The next prime is 21933473. The reversal of 21933472 is 27433912.

It is not an unprimeable number, because it can be changed into a prime (21933473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30804 + ... + 31507.

It is an arithmetic number, because the mean of its divisors is an integer number (1962828).

Almost surely, 2^21933472 is an apocalyptic number.

21933472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21933472 is an abundant number, since it is smaller than the sum of its proper divisors (25174400).

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

21933472 is a wasteful number, since it uses less digits than its factorization.

21933472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62332 (or 62324 counting only the distinct ones).

The product of its digits is 9072, while the sum is 31.

The square root of 21933472 is about 4683.3184815897. The cubic root of 21933472 is about 279.9212023166.

It can be divided in two parts, 2193 and 3472, that added together give a palindrome (5665).

The spelling of 21933472 in words is "twenty-one million, nine hundred thirty-three thousand, four hundred seventy-two".