21301312202113 has 4 divisors (see below), whose sum is σ = 21301329670740. Its totient is φ = 21301294733488.

The previous prime is 21301312202087. The next prime is 21301312202171. The reversal of 21301312202113 is 31120221310312.

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 6512234440464 + 14789077761649 = 2551908^2 + 3845657^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301312202113 - 2⁵ = 21301312202081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21301312205113) 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, 6755818 + ... + 9393811.

It is an arithmetic number, because the mean of its divisors is an integer number (5325332417685).

Almost surely, 2^{21301312202113} is an apocalyptic number.

It is an amenable number.

21301312202113 is a deficient number, since it is larger than the sum of its proper divisors (17468627).

21301312202113 is a wasteful number, since it uses less digits than its factorization.

21301312202113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17468626.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21301312202113 its reverse (31120221310312), we get a palindrome (52421533512425).

The spelling of 21301312202113 in words is "twenty-one trillion, three hundred one billion, three hundred twelve million, two hundred two thousand, one hundred thirteen".