13211123221 has 2 divisors, whose sum is σ = 13211123222. Its totient is φ = 13211123220.

The previous prime is 13211123201. The next prime is 13211123227. The reversal of 13211123221 is 12232111231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7527471121 + 5683652100 = 86761^2 + 75390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13211123221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13211123227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6605561610 + 6605561611.

It is an arithmetic number, because the mean of its divisors is an integer number (6605561611).

Almost surely, 2^13211123221 is an apocalyptic number.

It is an amenable number.

13211123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13211123221 is an equidigital number, since it uses as much as digits as its factorization.

13211123221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

Adding to 13211123221 its reverse (12232111231), we get a palindrome (25443234452).

The spelling of 13211123221 in words is "thirteen billion, two hundred eleven million, one hundred twenty-three thousand, two hundred twenty-one".