21313200311321 has 2 divisors, whose sum is σ = 21313200311322. Its totient is φ = 21313200311320.

The previous prime is 21313200311317. The next prime is 21313200311453. The reversal of 21313200311321 is 12311300231312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12416038849600 + 8897161461721 = 3523640^2 + 2982811^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313200311321 - 2² = 21313200311317 is a prime.

It is not a weakly prime, because it can be changed into another prime (21313200311621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656600155660 + 10656600155661.

It is an arithmetic number, because the mean of its divisors is an integer number (10656600155661).

Almost surely, 2^{21313200311321} is an apocalyptic number.

It is an amenable number.

21313200311321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313200311321 is an equidigital number, since it uses as much as digits as its factorization.

21313200311321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21313200311321 its reverse (12311300231312), we get a palindrome (33624500542633).

The spelling of 21313200311321 in words is "twenty-one trillion, three hundred thirteen billion, two hundred million, three hundred eleven thousand, three hundred twenty-one".