20222011991 has 2 divisors, whose sum is σ = 20222011992. Its totient is φ = 20222011990.

The previous prime is 20222011987. The next prime is 20222012071. The reversal of 20222011991 is 19911022202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20222011991 - 2² = 20222011987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20222013991) 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, 10111005995 + 10111005996.

It is an arithmetic number, because the mean of its divisors is an integer number (10111005996).

Almost surely, 2^20222011991 is an apocalyptic number.

20222011991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20222011991 is an equidigital number, since it uses as much as digits as its factorization.

20222011991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 20222011991 in words is "twenty billion, two hundred twenty-two million, eleven thousand, nine hundred ninety-one".