21933788 has 12 divisors (see below), whose sum is σ = 38508960. Its totient is φ = 10931232.

The previous prime is 21933787. The next prime is 21933839. The reversal of 21933788 is 88733912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21933787) 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, 7508 + ... + 10011.

It is an arithmetic number, because the mean of its divisors is an integer number (3209080).

Almost surely, 2^21933788 is an apocalyptic number.

It is an amenable number.

21933788 is a deficient number, since it is larger than the sum of its proper divisors (16575172).

21933788 is a wasteful number, since it uses less digits than its factorization.

21933788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17836 (or 17834 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 21933788 is about 4683.3522182300. The cubic root of 21933788 is about 279.9225466041.

The spelling of 21933788 in words is "twenty-one million, nine hundred thirty-three thousand, seven hundred eighty-eight".