2120111291 has 2 divisors, whose sum is σ = 2120111292. Its totient is φ = 2120111290.

The previous prime is 2120111267. The next prime is 2120111309. The reversal of 2120111291 is 1921110212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2120111291 - 2²² = 2115916987 is a prime.

It is not a weakly prime, because it can be changed into another prime (2120111221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060055645 + 1060055646.

It is an arithmetic number, because the mean of its divisors is an integer number (1060055646).

Almost surely, 2^2120111291 is an apocalyptic number.

2120111291 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120111291 is an equidigital number, since it uses as much as digits as its factorization.

2120111291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 2120111291 is about 46044.6662600567. Note that the first 3 decimals coincide. The cubic root of 2120111291 is about 1284.6541365553.

The spelling of 2120111291 in words is "two billion, one hundred twenty million, one hundred eleven thousand, two hundred ninety-one".