2122020991 has 2 divisors, whose sum is σ = 2122020992. Its totient is φ = 2122020990.

The previous prime is 2122020983. The next prime is 2122021043. The reversal of 2122020991 is 1990202212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2122020991 - 2³ = 2122020983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122020931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061010495 + 1061010496.

It is an arithmetic number, because the mean of its divisors is an integer number (1061010496).

Almost surely, 2^2122020991 is an apocalyptic number.

2122020991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122020991 is an equidigital number, since it uses as much as digits as its factorization.

2122020991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 2122020991 is about 46065.3990648079. The cubic root of 2122020991 is about 1285.0397401751.

The spelling of 2122020991 in words is "two billion, one hundred twenty-two million, twenty thousand, nine hundred ninety-one".