2021000022091 has 2 divisors, whose sum is σ = 2021000022092. Its totient is φ = 2021000022090.

The previous prime is 2021000022077. The next prime is 2021000022133. The reversal of 2021000022091 is 1902200001202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021000022091 - 2³⁷ = 1883561068619 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021000026091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010500011045 + 1010500011046.

It is an arithmetic number, because the mean of its divisors is an integer number (1010500011046).

Almost surely, 2^{2021000022091} is an apocalyptic number.

2021000022091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021000022091 is an equidigital number, since it uses as much as digits as its factorization.

2021000022091 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 19.

Adding to 2021000022091 its reverse (1902200001202), we get a palindrome (3923200023293).

The spelling of 2021000022091 in words is "two trillion, twenty-one billion, twenty-two thousand, ninety-one".