21923124 has 24 divisors (see below), whose sum is σ = 51236640. Its totient is φ = 7295904.

The previous prime is 21923119. The next prime is 21923147. The reversal of 21923124 is 42132912.

It is a junction number, because it is equal to n+sod(n) for n = 21923094 and 21923103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9562 + ... + 11630.

It is an arithmetic number, because the mean of its divisors is an integer number (2134860).

Almost surely, 2^21923124 is an apocalyptic number.

It is an amenable number.

21923124 is an abundant number, since it is smaller than the sum of its proper divisors (29313516).

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

21923124 is a wasteful number, since it uses less digits than its factorization.

21923124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2959 (or 2957 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 21923124 is about 4682.2135790671. The cubic root of 21923124 is about 279.8771740197.

The spelling of 21923124 in words is "twenty-one million, nine hundred twenty-three thousand, one hundred twenty-four".