2122012001991 has 16 divisors (see below), whose sum is σ = 3233569090304. Its totient is φ = 1212568164864.

The previous prime is 2122012001959. The next prime is 2122012001999. The reversal of 2122012001991 is 1991002102212.

It is not a de Polignac number, because 2122012001991 - 2⁵ = 2122012001959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122012001999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2686656 + ... + 3385578.

It is an arithmetic number, because the mean of its divisors is an integer number (202098068144).

Almost surely, 2^{2122012001991} is an apocalyptic number.

2122012001991 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2122012001991 is a deficient number, since it is larger than the sum of its proper divisors (1111557088313).

2122012001991 is a wasteful number, since it uses less digits than its factorization.

2122012001991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843510.

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 2122012001991 in words is "two trillion, one hundred twenty-two billion, twelve million, one thousand, nine hundred ninety-one".