13330121221 has 2 divisors, whose sum is σ = 13330121222. Its totient is φ = 13330121220.

The previous prime is 13330121149. The next prime is 13330121257. The reversal of 13330121221 is 12212103331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13329857025 + 264196 = 115455^2 + 514^2 .

It is an emirp because it is prime and its reverse (12212103331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13330121221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13330121921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6665060610 + 6665060611.

It is an arithmetic number, because the mean of its divisors is an integer number (6665060611).

Almost surely, 2^13330121221 is an apocalyptic number.

It is an amenable number.

13330121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13330121221 is an equidigital number, since it uses as much as digits as its factorization.

13330121221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 13330121221 its reverse (12212103331), we get a palindrome (25542224552).

The spelling of 13330121221 in words is "thirteen billion, three hundred thirty million, one hundred twenty-one thousand, two hundred twenty-one".