21302123313311 has 4 divisors (see below), whose sum is σ = 21302132961792. Its totient is φ = 21302113664832.

The previous prime is 21302123313299. The next prime is 21302123313319. The reversal of 21302123313311 is 11331332120312.

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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302123313311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302123313319) 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, 306146 + ... + 6534368.

It is an arithmetic number, because the mean of its divisors is an integer number (5325533240448).

Almost surely, 2^{21302123313311} is an apocalyptic number.

21302123313311 is a deficient number, since it is larger than the sum of its proper divisors (9648481).

21302123313311 is an equidigital number, since it uses as much as digits as its factorization.

21302123313311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9648480.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 21302123313311 its reverse (11331332120312), we get a palindrome (32633455433623).

The spelling of 21302123313311 in words is "twenty-one trillion, three hundred two billion, one hundred twenty-three million, three hundred thirteen thousand, three hundred eleven".