13233331921 has 2 divisors, whose sum is σ = 13233331922. Its totient is φ = 13233331920.

The previous prime is 13233331919. The next prime is 13233332027. The reversal of 13233331921 is 12913333231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13233281296 + 50625 = 115036^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 13233331921 - 2¹ = 13233331919 is a prime.

Together with 13233331919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13233331721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6616665960 + 6616665961.

It is an arithmetic number, because the mean of its divisors is an integer number (6616665961).

Almost surely, 2^13233331921 is an apocalyptic number.

It is an amenable number.

13233331921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13233331921 is an equidigital number, since it uses as much as digits as its factorization.

13233331921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 31.

The spelling of 13233331921 in words is "thirteen billion, two hundred thirty-three million, three hundred thirty-one thousand, nine hundred twenty-one".