21316707 has 6 divisors (see below), whose sum is σ = 30790812. Its totient is φ = 14211132.

The previous prime is 21316693. The next prime is 21316721. The reversal of 21316707 is 70761312.

It is an interprime number because it is at equal distance from previous prime (21316693) and next prime (21316721).

It is not a de Polignac number, because 21316707 - 2⁶ = 21316643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21316307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1184253 + ... + 1184270.

It is an arithmetic number, because the mean of its divisors is an integer number (5131802).

Almost surely, 2^21316707 is an apocalyptic number.

21316707 is a deficient number, since it is larger than the sum of its proper divisors (9474105).

21316707 is a wasteful number, since it uses less digits than its factorization.

21316707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368529 (or 2368526 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 21316707 is about 4617.0019493173. The cubic root of 21316707 is about 277.2724406665.

The spelling of 21316707 in words is "twenty-one million, three hundred sixteen thousand, seven hundred seven".