21713696 has 12 divisors (see below), whose sum is σ = 42748902. Its totient is φ = 10856832.

The previous prime is 21713693. The next prime is 21713707. The reversal of 21713696 is 69631712.

It can be written as a sum of positive squares in only one way, i.e., 20830096 + 883600 = 4564^2 + 940^2 .

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 as a sum of consecutive naturals, namely, 339245 + ... + 339308.

Almost surely, 2^21713696 is an apocalyptic number.

It is an amenable number.

21713696 is a deficient number, since it is larger than the sum of its proper divisors (21035206).

21713696 is an equidigital number, since it uses as much as digits as its factorization.

21713696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678563 (or 678555 counting only the distinct ones).

The product of its digits is 13608, while the sum is 35.

The square root of 21713696 is about 4659.7957036763. The cubic root of 21713696 is about 278.9831141316.

The spelling of 21713696 in words is "twenty-one million, seven hundred thirteen thousand, six hundred ninety-six".