21933432 has 24 divisors (see below), whose sum is σ = 59403240. Its totient is φ = 7311120.

The previous prime is 21933419. The next prime is 21933449. The reversal of 21933432 is 23433912.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21933396 and 21933405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 152244 + ... + 152387.

It is an arithmetic number, because the mean of its divisors is an integer number (2475135).

Almost surely, 2^21933432 is an apocalyptic number.

It is an amenable number.

21933432 is an abundant number, since it is smaller than the sum of its proper divisors (37469808).

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

21933432 is a wasteful number, since it uses less digits than its factorization.

21933432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304643 (or 304636 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 21933432 is about 4683.3142111116. The cubic root of 21933432 is about 279.9210321527.

It can be divided in two parts, 2193 and 3432, that added together give a square (5625 = 75²).

The spelling of 21933432 in words is "twenty-one million, nine hundred thirty-three thousand, four hundred thirty-two".