211202202111991 has 2 divisors, whose sum is σ = 211202202111992. Its totient is φ = 211202202111990.

The previous prime is 211202202111941. The next prime is 211202202112001. The reversal of 211202202111991 is 199111202202112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211202202111991 - 2³³ = 211193612177399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211202202111911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105601101055995 + 105601101055996.

It is an arithmetic number, because the mean of its divisors is an integer number (105601101055996).

Almost surely, 2^{211202202111991} is an apocalyptic number.

211202202111991 is a deficient number, since it is larger than the sum of its proper divisors (1).

211202202111991 is an equidigital number, since it uses as much as digits as its factorization.

211202202111991 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 34.

The spelling of 211202202111991 in words is "two hundred eleven trillion, two hundred two billion, two hundred two million, one hundred eleven thousand, nine hundred ninety-one".