2100019091 has 2 divisors, whose sum is σ = 2100019092. Its totient is φ = 2100019090.

The previous prime is 2100019087. The next prime is 2100019093. The reversal of 2100019091 is 1909100012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2100019091 - 2² = 2100019087 is a prime.

Together with 2100019093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2100019093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050009545 + 1050009546.

It is an arithmetic number, because the mean of its divisors is an integer number (1050009546).

Almost surely, 2^2100019091 is an apocalyptic number.

2100019091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100019091 is an equidigital number, since it uses as much as digits as its factorization.

2100019091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 2100019091 is about 45825.9652489721. The cubic root of 2100019091 is about 1280.5830455371.

It can be divided in two parts, 210001 and 9091, that multiplied together give a palindrome (1909119091).

The spelling of 2100019091 in words is "two billion, one hundred million, nineteen thousand, ninety-one".