211222102401991 has 2 divisors, whose sum is σ = 211222102401992. Its totient is φ = 211222102401990.

The previous prime is 211222102401967. The next prime is 211222102402021. The reversal of 211222102401991 is 199104201222112.

It is a happy number.

211222102401991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211222102401991 - 2²⁹ = 211221565531079 is a prime.

It is a super-2 number, since 2×211222102401991² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211222102401991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211222102401941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105611051200995 + 105611051200996.

It is an arithmetic number, because the mean of its divisors is an integer number (105611051200996).

Almost surely, 2^{211222102401991} is an apocalyptic number.

211222102401991 is a deficient number, since it is larger than the sum of its proper divisors (1).

211222102401991 is an equidigital number, since it uses as much as digits as its factorization.

211222102401991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 211222102401991 in words is "two hundred eleven trillion, two hundred twenty-two billion, one hundred two million, four hundred one thousand, nine hundred ninety-one".