21021300213313 has 4 divisors (see below), whose sum is σ = 21023632553428. Its totient is φ = 21018967873200.

The previous prime is 21021300213301. The next prime is 21021300213317. The reversal of 21021300213313 is 31331200312012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6959640200769 + 14061660012544 = 2638113^2 + 3749888^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021300213313 - 2⁵ = 21021300213281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021300213317) 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, 1166156538 + ... + 1166174563.

It is an arithmetic number, because the mean of its divisors is an integer number (5255908138357).

Almost surely, 2^{21021300213313} is an apocalyptic number.

It is an amenable number.

21021300213313 is a deficient number, since it is larger than the sum of its proper divisors (2332340115).

21021300213313 is an equidigital number, since it uses as much as digits as its factorization.

21021300213313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332340114.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21021300213313 its reverse (31331200312012), we get a palindrome (52352500525325).

The spelling of 21021300213313 in words is "twenty-one trillion, twenty-one billion, three hundred million, two hundred thirteen thousand, three hundred thirteen".