21943713 has 24 divisors (see below), whose sum is σ = 32720128. Its totient is φ = 13068000.

The previous prime is 21943711. The next prime is 21943723. The reversal of 21943713 is 31734912.

It is not a de Polignac number, because 21943713 - 2¹ = 21943711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21943711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21648 + ... + 22638.

Almost surely, 2^21943713 is an apocalyptic number.

It is an amenable number.

21943713 is a deficient number, since it is larger than the sum of its proper divisors (10776415).

21943713 is a wasteful number, since it uses less digits than its factorization.

21943713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077 (or 1066 counting only the distinct ones).

The product of its digits is 4536, while the sum is 30.

The square root of 21943713 is about 4684.4117026581. The cubic root of 21943713 is about 279.9647617219.

The spelling of 21943713 in words is "twenty-one million, nine hundred forty-three thousand, seven hundred thirteen".