2101200991 has 2 divisors, whose sum is σ = 2101200992. Its totient is φ = 2101200990.

The previous prime is 2101200979. The next prime is 2101201009. The reversal of 2101200991 is 1990021012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2101200991 - 2¹¹ = 2101198943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101200931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050600495 + 1050600496.

It is an arithmetic number, because the mean of its divisors is an integer number (1050600496).

Almost surely, 2^2101200991 is an apocalyptic number.

2101200991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101200991 is an equidigital number, since it uses as much as digits as its factorization.

2101200991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 2101200991 is about 45838.8589626749. The cubic root of 2101200991 is about 1280.8232397427.

The spelling of 2101200991 in words is "two billion, one hundred one million, two hundred thousand, nine hundred ninety-one".