12220999991 has 2 divisors, whose sum is σ = 12220999992. Its totient is φ = 12220999990.

The previous prime is 12220999979. The next prime is 12221000003. The reversal of 12220999991 is 19999902221.

It is a balanced prime because it is at equal distance from previous prime (12220999979) and next prime (12221000003).

It is a cyclic number.

It is not a de Polignac number, because 12220999991 - 2¹⁰ = 12220998967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12220999391) 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, 6110499995 + 6110499996.

It is an arithmetic number, because the mean of its divisors is an integer number (6110499996).

Almost surely, 2^12220999991 is an apocalyptic number.

12220999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220999991 is an equidigital number, since it uses as much as digits as its factorization.

12220999991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 472392, while the sum is 53.

The spelling of 12220999991 in words is "twelve billion, two hundred twenty million, nine hundred ninety-nine thousand, nine hundred ninety-one".