21713699 has 4 divisors (see below), whose sum is σ = 24815664. Its totient is φ = 18611736.

The previous prime is 21713693. The next prime is 21713707. The reversal of 21713699 is 99631712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21713699 - 2⁴ = 21713683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21713693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1550972 + ... + 1550985.

It is an arithmetic number, because the mean of its divisors is an integer number (6203916).

Almost surely, 2^21713699 is an apocalyptic number.

21713699 is a deficient number, since it is larger than the sum of its proper divisors (3101965).

21713699 is an equidigital number, since it uses as much as digits as its factorization.

21713699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101964.

The product of its digits is 20412, while the sum is 38.

The square root of 21713699 is about 4659.7960255788. The cubic root of 21713699 is about 278.9831269798.

The spelling of 21713699 in words is "twenty-one million, seven hundred thirteen thousand, six hundred ninety-nine".