12221112251 has 2 divisors, whose sum is σ = 12221112252. Its totient is φ = 12221112250.

The previous prime is 12221112209. The next prime is 12221112257. The reversal of 12221112251 is 15221112221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221112251 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12221112257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110556125 + 6110556126.

It is an arithmetic number, because the mean of its divisors is an integer number (6110556126).

Almost surely, 2^12221112251 is an apocalyptic number.

12221112251 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221112251 is an equidigital number, since it uses as much as digits as its factorization.

12221112251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 160, while the sum is 20.

Adding to 12221112251 its reverse (15221112221), we get a palindrome (27442224472).

The spelling of 12221112251 in words is "twelve billion, two hundred twenty-one million, one hundred twelve thousand, two hundred fifty-one".