21933630 has 24 divisors (see below), whose sum is σ = 57027672. Its totient is φ = 5848944.

The previous prime is 21933629. The next prime is 21933641. The reversal of 21933630 is 3633912.

21933630 is a `hidden beast` number, since 21 + 9 + 3 + 3 + 630 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21933594 and 21933603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121764 + ... + 121943.

It is an arithmetic number, because the mean of its divisors is an integer number (2376153).

Almost surely, 2^21933630 is an apocalyptic number.

21933630 is an abundant number, since it is smaller than the sum of its proper divisors (35094042).

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

21933630 is a wasteful number, since it uses less digits than its factorization.

21933630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243720 (or 243717 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 21933630 is about 4683.3353499403. The cubic root of 21933630 is about 279.9218744620.

The spelling of 21933630 in words is "twenty-one million, nine hundred thirty-three thousand, six hundred thirty".