12221267213 has 2 divisors, whose sum is σ = 12221267214. Its totient is φ = 12221267212.

The previous prime is 12221267171. The next prime is 12221267239. The reversal of 12221267213 is 31276212221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10766760169 + 1454507044 = 103763^2 + 38138^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221267213 - 2²⁶ = 12154158349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221267243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110633606 + 6110633607.

It is an arithmetic number, because the mean of its divisors is an integer number (6110633607).

Almost surely, 2^12221267213 is an apocalyptic number.

It is an amenable number.

12221267213 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221267213 is an equidigital number, since it uses as much as digits as its factorization.

12221267213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

Adding to 12221267213 its reverse (31276212221), we get a palindrome (43497479434).

The spelling of 12221267213 in words is "twelve billion, two hundred twenty-one million, two hundred sixty-seven thousand, two hundred thirteen".