21714924 has 96 divisors (see below), whose sum is σ = 64253952. Its totient is φ = 5544000.

The previous prime is 21714907. The next prime is 21714937. The reversal of 21714924 is 42941712.

It is a junction number, because it is equal to n+sod(n) for n = 21714891 and 21714900.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65439 + ... + 65769.

It is an arithmetic number, because the mean of its divisors is an integer number (669312).

Almost surely, 2^21714924 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21714924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32126976).

21714924 is an abundant number, since it is smaller than the sum of its proper divisors (42539028).

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

21714924 is a wasteful number, since it uses less digits than its factorization.

21714924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 425 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 21714924 is about 4659.9274672467. The cubic root of 21714924 is about 278.9883732517.

The spelling of 21714924 in words is "twenty-one million, seven hundred fourteen thousand, nine hundred twenty-four".