12221221213 has 2 divisors, whose sum is σ = 12221221214. Its totient is φ = 12221221212.

The previous prime is 12221221193. The next prime is 12221221217. The reversal of 12221221213 is 31212212221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10378923129 + 1842298084 = 101877^2 + 42922^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221221213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221221217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110610606 + 6110610607.

It is an arithmetic number, because the mean of its divisors is an integer number (6110610607).

Almost surely, 2^12221221213 is an apocalyptic number.

It is an amenable number.

12221221213 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221221213 is an equidigital number, since it uses as much as digits as its factorization.

12221221213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

Adding to 12221221213 its reverse (31212212221), we get a palindrome (43433433434).

The spelling of 12221221213 in words is "twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred thirteen".