2101122091 has 2 divisors, whose sum is σ = 2101122092. Its totient is φ = 2101122090.

The previous prime is 2101122073. The next prime is 2101122097. The reversal of 2101122091 is 1902211012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101122091 - 2¹³ = 2101113899 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101122097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050561045 + 1050561046.

It is an arithmetic number, because the mean of its divisors is an integer number (1050561046).

Almost surely, 2^2101122091 is an apocalyptic number.

2101122091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101122091 is an equidigital number, since it uses as much as digits as its factorization.

2101122091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 2101122091 is about 45837.9983310790. The cubic root of 2101122091 is about 1280.8072079242.

The spelling of 2101122091 in words is "two billion, one hundred one million, one hundred twenty-two thousand, ninety-one".