21310023233813 has 2 divisors, whose sum is σ = 21310023233814. Its totient is φ = 21310023233812.

The previous prime is 21310023233687. The next prime is 21310023233909. The reversal of 21310023233813 is 31833232001312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20994788148049 + 315235085764 = 4582007^2 + 561458^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310023233813 - 2¹⁰ = 21310023232789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21310023233813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310023733813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655011616906 + 10655011616907.

It is an arithmetic number, because the mean of its divisors is an integer number (10655011616907).

Almost surely, 2^{21310023233813} is an apocalyptic number.

It is an amenable number.

21310023233813 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310023233813 is an equidigital number, since it uses as much as digits as its factorization.

21310023233813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The spelling of 21310023233813 in words is "twenty-one trillion, three hundred ten billion, twenty-three million, two hundred thirty-three thousand, eight hundred thirteen".