21313410233 has 4 divisors (see below), whose sum is σ = 21319080948. Its totient is φ = 21307739520.

The previous prime is 21313410199. The next prime is 21313410241. The reversal of 21313410233 is 33201431312.

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 5957987344 + 15355422889 = 77188^2 + 123917^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313410233 - 2²² = 21309215929 is a prime.

It is a super-2 number, since 2×21313410233² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21313410199 and 21313410208.

It is not an unprimeable number, because it can be changed into a prime (21313410733) 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, 2829716 + ... + 2837237.

It is an arithmetic number, because the mean of its divisors is an integer number (5329770237).

Almost surely, 2^21313410233 is an apocalyptic number.

It is an amenable number.

21313410233 is a deficient number, since it is larger than the sum of its proper divisors (5670715).

21313410233 is an equidigital number, since it uses as much as digits as its factorization.

21313410233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5670714.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21313410233 its reverse (33201431312), we get a palindrome (54514841545).

The spelling of 21313410233 in words is "twenty-one billion, three hundred thirteen million, four hundred ten thousand, two hundred thirty-three".