21130313233 has 4 divisors (see below), whose sum is σ = 22049022528. Its totient is φ = 20211603940.

The previous prime is 21130313209. The next prime is 21130313263. The reversal of 21130313233 is 33231303112.

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 a de Polignac number, because none of the positive numbers 2^k-21130313233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130313263) 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, 459354613 + ... + 459354658.

It is an arithmetic number, because the mean of its divisors is an integer number (5512255632).

Almost surely, 2^21130313233 is an apocalyptic number.

21130313233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21130313233 is a deficient number, since it is larger than the sum of its proper divisors (918709295).

21130313233 is an equidigital number, since it uses as much as digits as its factorization.

21130313233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918709294.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21130313233 its reverse (33231303112), we get a palindrome (54361616345).

The spelling of 21130313233 in words is "twenty-one billion, one hundred thirty million, three hundred thirteen thousand, two hundred thirty-three".