21316339 has 8 divisors (see below), whose sum is σ = 23288832. Its totient is φ = 19349640.

The previous prime is 21316319. The next prime is 21316349. The reversal of 21316339 is 93361312.

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 21316339 - 2⁵ = 21316307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21316319) 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, 10782 + ... + 12604.

It is an arithmetic number, because the mean of its divisors is an integer number (2911104).

Almost surely, 2^21316339 is an apocalyptic number.

21316339 is a deficient number, since it is larger than the sum of its proper divisors (1972493).

21316339 is a wasteful number, since it uses less digits than its factorization.

21316339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897.

The product of its digits is 2916, while the sum is 28.

The square root of 21316339 is about 4616.9620964439. The cubic root of 21316339 is about 277.2708450973.

The spelling of 21316339 in words is "twenty-one million, three hundred sixteen thousand, three hundred thirty-nine".