21313211101321 has 4 divisors (see below), whose sum is σ = 21316257158212. Its totient is φ = 21310165044432.

The previous prime is 21313211101291. The next prime is 21313211101333. The reversal of 21313211101321 is 12310111231312.

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 14253562101321 + 7059649000000 = 3775389^2 + 2657000^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313211101321 - 2²¹ = 21313209004169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21313211101292 and 21313211101301.

It is not an unprimeable number, because it can be changed into a prime (21313211501321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1523017950 + ... + 1523031943.

It is an arithmetic number, because the mean of its divisors is an integer number (5329064289553).

Almost surely, 2^{21313211101321} is an apocalyptic number.

It is an amenable number.

21313211101321 is a deficient number, since it is larger than the sum of its proper divisors (3046056891).

21313211101321 is an equidigital number, since it uses as much as digits as its factorization.

21313211101321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3046056890.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 21313211101321 its reverse (12310111231312), we get a palindrome (33623322332633).

The spelling of 21313211101321 in words is "twenty-one trillion, three hundred thirteen billion, two hundred eleven million, one hundred one thousand, three hundred twenty-one".