2111212091 has 2 divisors, whose sum is σ = 2111212092. Its totient is φ = 2111212090.

The previous prime is 2111212073. The next prime is 2111212097. The reversal of 2111212091 is 1902121112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2111212091 - 2¹⁸ = 2110949947 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2111212097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055606045 + 1055606046.

It is an arithmetic number, because the mean of its divisors is an integer number (1055606046).

Almost surely, 2^2111212091 is an apocalyptic number.

2111212091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111212091 is an equidigital number, since it uses as much as digits as its factorization.

2111212091 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 20.

The square root of 2111212091 is about 45947.9280381608. The cubic root of 2111212091 is about 1282.8541638477.

The spelling of 2111212091 in words is "two billion, one hundred eleven million, two hundred twelve thousand, ninety-one".