13233332221 has 2 divisors, whose sum is σ = 13233332222. Its totient is φ = 13233332220.

The previous prime is 13233332183. The next prime is 13233332317. The reversal of 13233332221 is 12223333231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12118707225 + 1114624996 = 110085^2 + 33386^2 .

It is a cyclic number.

It is not a de Polignac number, because 13233332221 - 2²⁷ = 13099114493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13233332621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6616666110 + 6616666111.

It is an arithmetic number, because the mean of its divisors is an integer number (6616666111).

Almost surely, 2^13233332221 is an apocalyptic number.

It is an amenable number.

13233332221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13233332221 is an equidigital number, since it uses as much as digits as its factorization.

13233332221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 25.

Adding to 13233332221 its reverse (12223333231), we get a palindrome (25456665452).

The spelling of 13233332221 in words is "thirteen billion, two hundred thirty-three million, three hundred thirty-two thousand, two hundred twenty-one".