21312211300313 has 4 divisors (see below), whose sum is σ = 21312955964388. Its totient is φ = 21311466636240.

The previous prime is 21312211300309. The next prime is 21312211300321. The reversal of 21312211300313 is 31300311221312.

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 48935191369 + 21263276108944 = 221213^2 + 4611212^2 .

It is a cyclic number.

It is not a de Polignac number, because 21312211300313 - 2² = 21312211300309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312211300333) 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, 372289106 + ... + 372346347.

It is an arithmetic number, because the mean of its divisors is an integer number (5328238991097).

Almost surely, 2^{21312211300313} is an apocalyptic number.

It is an amenable number.

21312211300313 is a deficient number, since it is larger than the sum of its proper divisors (744664075).

21312211300313 is an equidigital number, since it uses as much as digits as its factorization.

21312211300313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744664074.

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

Adding to 21312211300313 its reverse (31300311221312), we get a palindrome (52612522521625).

The spelling of 21312211300313 in words is "twenty-one trillion, three hundred twelve billion, two hundred eleven million, three hundred thousand, three hundred thirteen".