2021111202091 has 2 divisors, whose sum is σ = 2021111202092. Its totient is φ = 2021111202090.

The previous prime is 2021111202049. The next prime is 2021111202107. The reversal of 2021111202091 is 1902021111202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021111202091 - 2⁹ = 2021111201579 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021111202191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010555601045 + 1010555601046.

It is an arithmetic number, because the mean of its divisors is an integer number (1010555601046).

Almost surely, 2^{2021111202091} is an apocalyptic number.

2021111202091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021111202091 is an equidigital number, since it uses as much as digits as its factorization.

2021111202091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 2021111202091 its reverse (1902021111202), we get a palindrome (3923132313293).

The spelling of 2021111202091 in words is "two trillion, twenty-one billion, one hundred eleven million, two hundred two thousand, ninety-one".