21914724 has 48 divisors (see below), whose sum is σ = 56024640. Its totient is φ = 6625920.

The previous prime is 21914723. The next prime is 21914731. The reversal of 21914724 is 42741912.

It is a junction number, because it is equal to n+sod(n) for n = 21914691 and 21914700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21914723) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8014 + ... + 10394.

It is an arithmetic number, because the mean of its divisors is an integer number (1167180).

Almost surely, 2^21914724 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 21914724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28012320).

21914724 is an abundant number, since it is smaller than the sum of its proper divisors (34109916).

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

21914724 is a wasteful number, since it uses less digits than its factorization.

21914724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460 (or 2458 counting only the distinct ones).

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

The square root of 21914724 is about 4681.3164815039. The cubic root of 21914724 is about 279.8414238138.

The spelling of 21914724 in words is "twenty-one million, nine hundred fourteen thousand, seven hundred twenty-four".