13221210217 has 2 divisors, whose sum is σ = 13221210218. Its totient is φ = 13221210216.

The previous prime is 13221210203. The next prime is 13221210227. The reversal of 13221210217 is 71201212231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12139852761 + 1081357456 = 110181^2 + 32884^2 .

It is a cyclic number.

It is not a de Polignac number, because 13221210217 - 2²⁷ = 13086992489 is a prime.

It is not a weakly prime, because it can be changed into another prime (13221210227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610605108 + 6610605109.

It is an arithmetic number, because the mean of its divisors is an integer number (6610605109).

Almost surely, 2^13221210217 is an apocalyptic number.

It is an amenable number.

13221210217 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221210217 is an equidigital number, since it uses as much as digits as its factorization.

13221210217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 13221210217 its reverse (71201212231), we get a palindrome (84422422448).

The spelling of 13221210217 in words is "thirteen billion, two hundred twenty-one million, two hundred ten thousand, two hundred seventeen".