21924633 has 12 divisors (see below), whose sum is σ = 29632848. Its totient is φ = 14419080.

The previous prime is 21924629. The next prime is 21924647. The reversal of 21924633 is 33642912.

It is not a de Polignac number, because 21924633 - 2² = 21924629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21924633.

It is not an unprimeable number, because it can be changed into a prime (21924653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18138 + ... + 19308.

It is an arithmetic number, because the mean of its divisors is an integer number (2469404).

Almost surely, 2^21924633 is an apocalyptic number.

It is an amenable number.

21924633 is a deficient number, since it is larger than the sum of its proper divisors (7708215).

21924633 is an equidigital number, since it uses as much as digits as its factorization.

21924633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1253 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 21924633 is about 4682.3747180250. The cubic root of 21924633 is about 279.8835953212.

The spelling of 21924633 in words is "twenty-one million, nine hundred twenty-four thousand, six hundred thirty-three".