21363924 has 24 divisors (see below), whose sum is σ = 50345568. Its totient is φ = 7050400.

The previous prime is 21363907. The next prime is 21363949. The reversal of 21363924 is 42936312.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21363891 and 21363900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7602 + ... + 10025.

It is an arithmetic number, because the mean of its divisors is an integer number (2097732).

Almost surely, 2^21363924 is an apocalyptic number.

It is an amenable number.

21363924 is an abundant number, since it is smaller than the sum of its proper divisors (28981644).

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

21363924 is a wasteful number, since it uses less digits than its factorization.

21363924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17735 (or 17733 counting only the distinct ones).

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

The square root of 21363924 is about 4622.1125040397. The cubic root of 21363924 is about 277.4770113251.

The spelling of 21363924 in words is "twenty-one million, three hundred sixty-three thousand, nine hundred twenty-four".