2112222991 has 2 divisors, whose sum is σ = 2112222992. Its totient is φ = 2112222990.

The previous prime is 2112222971. The next prime is 2112222997. The reversal of 2112222991 is 1992222112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2112222991 - 2⁷ = 2112222863 is a prime.

It is a super-2 number, since 2×2112222991² = 8922971927417972162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112222997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056111495 + 1056111496.

It is an arithmetic number, because the mean of its divisors is an integer number (1056111496).

Almost surely, 2^2112222991 is an apocalyptic number.

2112222991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112222991 is an equidigital number, since it uses as much as digits as its factorization.

2112222991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 31.

The square root of 2112222991 is about 45958.9272176799. The cubic root of 2112222991 is about 1283.0588851623.

The spelling of 2112222991 in words is "two billion, one hundred twelve million, two hundred twenty-two thousand, nine hundred ninety-one".