2113121129991 has 4 divisors (see below), whose sum is σ = 2817494839992. Its totient is φ = 1408747419992.

The previous prime is 2113121129941. The next prime is 2113121129993. The reversal of 2113121129991 is 1999211213112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2113121129991 - 2¹⁰ = 2113121128967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113121129993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352186854996 + ... + 352186855001.

It is an arithmetic number, because the mean of its divisors is an integer number (704373709998).

Almost surely, 2^{2113121129991} is an apocalyptic number.

2113121129991 is a deficient number, since it is larger than the sum of its proper divisors (704373710001).

2113121129991 is an equidigital number, since it uses as much as digits as its factorization.

2113121129991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704373710000.

The product of its digits is 17496, while the sum is 42.

The spelling of 2113121129991 in words is "two trillion, one hundred thirteen billion, one hundred twenty-one million, one hundred twenty-nine thousand, nine hundred ninety-one".