2111021110091 has 4 divisors (see below), whose sum is σ = 2111062779432. Its totient is φ = 2110979440752.

The previous prime is 2111021110087. The next prime is 2111021110111. The reversal of 2111021110091 is 1900111201112.

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 2111021110091 - 2² = 2111021110087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111021110021) 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, 20758586 + ... + 20860031.

It is an arithmetic number, because the mean of its divisors is an integer number (527765694858).

Almost surely, 2^{2111021110091} is an apocalyptic number.

2111021110091 is a deficient number, since it is larger than the sum of its proper divisors (41669341).

2111021110091 is an equidigital number, since it uses as much as digits as its factorization.

2111021110091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41669340.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 2111021110091 in words is "two trillion, one hundred eleven billion, twenty-one million, one hundred ten thousand, ninety-one".