21310313 has 8 divisors (see below), whose sum is σ = 21576000. Its totient is φ = 21046608.

The previous prime is 21310309. The next prime is 21310319. The reversal of 21310313 is 31301312.

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 21310313 - 2² = 21310309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310319) 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, 34118 + ... + 34736.

It is an arithmetic number, because the mean of its divisors is an integer number (2697000).

Almost surely, 2^21310313 is an apocalyptic number.

It is an amenable number.

21310313 is a deficient number, since it is larger than the sum of its proper divisors (265687).

21310313 is a wasteful number, since it uses less digits than its factorization.

21310313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 21310313 is about 4616.3094566981. The cubic root of 21310313 is about 277.2447150384.

Adding to 21310313 its reverse (31301312), we get a palindrome (52611625).

Subtracting 21310313 from its reverse (31301312), we obtain a palindrome (9990999).

The spelling of 21310313 in words is "twenty-one million, three hundred ten thousand, three hundred thirteen".