2111220091 has 2 divisors, whose sum is σ = 2111220092. Its totient is φ = 2111220090.

The previous prime is 2111220061. The next prime is 2111220109. The reversal of 2111220091 is 1900221112.

It is a happy number.

Together with next prime (2111220109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2111220091 - 2¹³ = 2111211899 is a prime.

It is not a weakly prime, because it can be changed into another prime (2111220031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055610045 + 1055610046.

It is an arithmetic number, because the mean of its divisors is an integer number (1055610046).

Almost surely, 2^2111220091 is an apocalyptic number.

2111220091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111220091 is an equidigital number, since it uses as much as digits as its factorization.

2111220091 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 2111220091 is about 45948.0150931463. The cubic root of 2111220091 is about 1282.8557842155.

The spelling of 2111220091 in words is "two billion, one hundred eleven million, two hundred twenty thousand, ninety-one".