21719713 has 8 divisors (see below), whose sum is σ = 22026368. Its totient is φ = 21415104.

The previous prime is 21719699. The next prime is 21719741. The reversal of 21719713 is 31791712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21719713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21719743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44356 + ... + 44842.

It is an arithmetic number, because the mean of its divisors is an integer number (2753296).

Almost surely, 2^21719713 is an apocalyptic number.

It is an amenable number.

21719713 is a deficient number, since it is larger than the sum of its proper divisors (306655).

21719713 is a wasteful number, since it uses less digits than its factorization.

21719713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023.

The product of its digits is 2646, while the sum is 31.

The square root of 21719713 is about 4660.4412881185. The cubic root of 21719713 is about 279.0088810695.

The spelling of 21719713 in words is "twenty-one million, seven hundred nineteen thousand, seven hundred thirteen".