21300321313 has 4 divisors (see below), whose sum is σ = 21300623748. Its totient is φ = 21300018880.

The previous prime is 21300321253. The next prime is 21300321323. The reversal of 21300321313 is 31312300312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12573585424 + 8726735889 = 112132^2 + 93417^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300321313 - 2³³ = 12710386721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300321323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16245 + ... + 207037.

It is an arithmetic number, because the mean of its divisors is an integer number (5325155937).

Almost surely, 2^21300321313 is an apocalyptic number.

It is an amenable number.

21300321313 is a deficient number, since it is larger than the sum of its proper divisors (302435).

21300321313 is a wasteful number, since it uses less digits than its factorization.

21300321313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302434.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21300321313 its reverse (31312300312), we get a palindrome (52612621625).

The spelling of 21300321313 in words is "twenty-one billion, three hundred million, three hundred twenty-one thousand, three hundred thirteen".