12222202221221 has 2 divisors, whose sum is σ = 12222202221222. Its totient is φ = 12222202221220.

The previous prime is 12222202221199. The next prime is 12222202221239. The reversal of 12222202221221 is 12212220222221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10297007121025 + 1925195100196 = 3208895^2 + 1387514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12222202221221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12222205221221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6111101110610 + 6111101110611.

It is an arithmetic number, because the mean of its divisors is an integer number (6111101110611).

Almost surely, 2^{12222202221221} is an apocalyptic number.

It is an amenable number.

12222202221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12222202221221 is an equidigital number, since it uses as much as digits as its factorization.

12222202221221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 12222202221221 its reverse (12212220222221), we get a palindrome (24434422443442).

The spelling of 12222202221221 in words is "twelve trillion, two hundred twenty-two billion, two hundred two million, two hundred twenty-one thousand, two hundred twenty-one".