21310645339 has 8 divisors (see below), whose sum is σ = 21488947200. Its totient is φ = 21132507816.

The previous prime is 21310645337. The next prime is 21310645357. The reversal of 21310645339 is 93354601312.

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 21310645339 - 2¹ = 21310645337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21310645298 and 21310645307.

It is not an unprimeable number, because it can be changed into a prime (21310645337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226602 + ... + 306544.

It is an arithmetic number, because the mean of its divisors is an integer number (2686118400).

Almost surely, 2^21310645339 is an apocalyptic number.

21310645339 is a deficient number, since it is larger than the sum of its proper divisors (178301861).

21310645339 is a wasteful number, since it uses less digits than its factorization.

21310645339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82169.

The product of its (nonzero) digits is 58320, while the sum is 37.

The spelling of 21310645339 in words is "twenty-one billion, three hundred ten million, six hundred forty-five thousand, three hundred thirty-nine".