21713417 has 8 divisors (see below), whose sum is σ = 23735712. Its totient is φ = 19699200.

The previous prime is 21713407. The next prime is 21713443. The reversal of 21713417 is 71431712.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21713417 - 2⁸ = 21713161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21713407) 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, 4553 + ... + 8009.

It is an arithmetic number, because the mean of its divisors is an integer number (2966964).

Almost surely, 2^21713417 is an apocalyptic number.

It is an amenable number.

21713417 is a deficient number, since it is larger than the sum of its proper divisors (2022295).

21713417 is a wasteful number, since it uses less digits than its factorization.

21713417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4039.

The product of its digits is 1176, while the sum is 26.

The square root of 21713417 is about 4659.7657666454. The cubic root of 21713417 is about 278.9819192387.

The spelling of 21713417 in words is "twenty-one million, seven hundred thirteen thousand, four hundred seventeen".