12221020201991 has 2 divisors, whose sum is σ = 12221020201992. Its totient is φ = 12221020201990.

The previous prime is 12221020201927. The next prime is 12221020202057. The reversal of 12221020201991 is 19910202012221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12221020201991 - 2⁶ = 12221020201927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221020206991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110510100995 + 6110510100996.

It is an arithmetic number, because the mean of its divisors is an integer number (6110510100996).

Almost surely, 2^{12221020201991} is an apocalyptic number.

12221020201991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221020201991 is an equidigital number, since it uses as much as digits as its factorization.

12221020201991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 12221020201991 in words is "twelve trillion, two hundred twenty-one billion, twenty million, two hundred one thousand, nine hundred ninety-one".