12221139251 has 2 divisors, whose sum is σ = 12221139252. Its totient is φ = 12221139250.

The previous prime is 12221139199. The next prime is 12221139311. The reversal of 12221139251 is 15293112221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12221139251 - 2¹⁰ = 12221138227 is a prime.

It is not a weakly prime, because it can be changed into another prime (12221139451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110569625 + 6110569626.

It is an arithmetic number, because the mean of its divisors is an integer number (6110569626).

Almost surely, 2^12221139251 is an apocalyptic number.

12221139251 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221139251 is an equidigital number, since it uses as much as digits as its factorization.

12221139251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 29.

The spelling of 12221139251 in words is "twelve billion, two hundred twenty-one million, one hundred thirty-nine thousand, two hundred fifty-one".