122000010991 has 2 divisors, whose sum is σ = 122000010992. Its totient is φ = 122000010990.

The previous prime is 122000010989. The next prime is 122000011039. The reversal of 122000010991 is 199010000221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 122000010991 - 2¹ = 122000010989 is a prime.

Together with 122000010989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122000010191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61000005495 + 61000005496.

It is an arithmetic number, because the mean of its divisors is an integer number (61000005496).

Almost surely, 2^122000010991 is an apocalyptic number.

122000010991 is a deficient number, since it is larger than the sum of its proper divisors (1).

122000010991 is an equidigital number, since it uses as much as digits as its factorization.

122000010991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 122000010991 in words is "one hundred twenty-two billion, ten thousand, nine hundred ninety-one".