21300021313 has 4 divisors (see below), whose sum is σ = 21317325568. Its totient is φ = 21282717060.

The previous prime is 21300021283. The next prime is 21300021331. The reversal of 21300021313 is 31312000312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300021313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300021343) 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, 8650281 + ... + 8652742.

It is an arithmetic number, because the mean of its divisors is an integer number (5329331392).

Almost surely, 2^21300021313 is an apocalyptic number.

It is an amenable number.

21300021313 is a deficient number, since it is larger than the sum of its proper divisors (17304255).

21300021313 is a wasteful number, since it uses less digits than its factorization.

21300021313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17304254.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21300021313 its reverse (31312000312), we get a palindrome (52612021625).

The spelling of 21300021313 in words is "twenty-one billion, three hundred million, twenty-one thousand, three hundred thirteen".