122120011991 has 8 divisors (see below), whose sum is σ = 122726554704. Its totient is φ = 121514702400.

The previous prime is 122120011903. The next prime is 122120012029. The reversal of 122120011991 is 199110021221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122120011991 - 2¹⁰ = 122120010967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122120019991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109406 + ... + 506171.

It is an arithmetic number, because the mean of its divisors is an integer number (15340819338).

Almost surely, 2^122120011991 is an apocalyptic number.

122120011991 is a deficient number, since it is larger than the sum of its proper divisors (606542713).

122120011991 is an equidigital number, since it uses as much as digits as its factorization.

122120011991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616561.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 122120011991 in words is "one hundred twenty-two billion, one hundred twenty million, eleven thousand, nine hundred ninety-one".