211030321321991 has 2 divisors, whose sum is σ = 211030321321992. Its totient is φ = 211030321321990.

The previous prime is 211030321321949. The next prime is 211030321322017. The reversal of 211030321321991 is 199123123030112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211030321321991 - 2¹⁴ = 211030321305607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211030321329991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105515160660995 + 105515160660996.

It is an arithmetic number, because the mean of its divisors is an integer number (105515160660996).

Almost surely, 2^{211030321321991} is an apocalyptic number.

211030321321991 is a deficient number, since it is larger than the sum of its proper divisors (1).

211030321321991 is an equidigital number, since it uses as much as digits as its factorization.

211030321321991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 211030321321991 in words is "two hundred eleven trillion, thirty billion, three hundred twenty-one million, three hundred twenty-one thousand, nine hundred ninety-one".