2121222091 has 2 divisors, whose sum is σ = 2121222092. Its totient is φ = 2121222090.

The previous prime is 2121222083. The next prime is 2121222097. The reversal of 2121222091 is 1902221212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121222091 - 2³ = 2121222083 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121222097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060611045 + 1060611046.

It is an arithmetic number, because the mean of its divisors is an integer number (1060611046).

Almost surely, 2^2121222091 is an apocalyptic number.

2121222091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121222091 is an equidigital number, since it uses as much as digits as its factorization.

2121222091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 2121222091 is about 46056.7268810974. The cubic root of 2121222091 is about 1284.8784557024.

The spelling of 2121222091 in words is "two billion, one hundred twenty-one million, two hundred twenty-two thousand, ninety-one".