21313898233 has 2 divisors, whose sum is σ = 21313898234. Its totient is φ = 21313898232.

The previous prime is 21313898227. The next prime is 21313898311. The reversal of 21313898233 is 33289831312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21186840249 + 127057984 = 145557^2 + 11272^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313898233 - 2⁵ = 21313898201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21313898233.

It is not a weakly prime, because it can be changed into another prime (21313898833) 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 as a sum of consecutive naturals, namely, 10656949116 + 10656949117.

It is an arithmetic number, because the mean of its divisors is an integer number (10656949117).

Almost surely, 2^21313898233 is an apocalyptic number.

It is an amenable number.

21313898233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313898233 is an equidigital number, since it uses as much as digits as its factorization.

21313898233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 43.

The spelling of 21313898233 in words is "twenty-one billion, three hundred thirteen million, eight hundred ninety-eight thousand, two hundred thirty-three".