21313323121133 has 4 divisors (see below), whose sum is σ = 21313356733728. Its totient is φ = 21313289508540.

The previous prime is 21313323121127. The next prime is 21313323121187. The reversal of 21313323121133 is 33112132331312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21313323121133 - 2⁴⁰ = 20213811493357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21313323121096 and 21313323121105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313323121333) 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, 15836513 + ... + 17129558.

It is an arithmetic number, because the mean of its divisors is an integer number (5328339183432).

Almost surely, 2^{21313323121133} is an apocalyptic number.

It is an amenable number.

21313323121133 is a deficient number, since it is larger than the sum of its proper divisors (33612595).

21313323121133 is an equidigital number, since it uses as much as digits as its factorization.

21313323121133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33612594.

The product of its digits is 5832, while the sum is 29.

Adding to 21313323121133 its reverse (33112132331312), we get a palindrome (54425455452445).

The spelling of 21313323121133 in words is "twenty-one trillion, three hundred thirteen billion, three hundred twenty-three million, one hundred twenty-one thousand, one hundred thirty-three".