11312021199991 has 2 divisors, whose sum is σ = 11312021199992. Its totient is φ = 11312021199990.

The previous prime is 11312021199959. The next prime is 11312021200027. The reversal of 11312021199991 is 19999112021311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11312021199991 - 2⁵ = 11312021199959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11312021199911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5656010599995 + 5656010599996.

It is an arithmetic number, because the mean of its divisors is an integer number (5656010599996).

Almost surely, 2^{11312021199991} is an apocalyptic number.

11312021199991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11312021199991 is an equidigital number, since it uses as much as digits as its factorization.

11312021199991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 49.

The spelling of 11312021199991 in words is "eleven trillion, three hundred twelve billion, twenty-one million, one hundred ninety-nine thousand, nine hundred ninety-one".