2021993822491 has 2 divisors, whose sum is σ = 2021993822492. Its totient is φ = 2021993822490.

The previous prime is 2021993822413. The next prime is 2021993822503. The reversal of 2021993822491 is 1942283991202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021993822491 - 2¹⁵ = 2021993789723 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021993522491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010996911245 + 1010996911246.

It is an arithmetic number, because the mean of its divisors is an integer number (1010996911246).

Almost surely, 2^{2021993822491} is an apocalyptic number.

2021993822491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021993822491 is an equidigital number, since it uses as much as digits as its factorization.

2021993822491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 2021993822491 in words is "two trillion, twenty-one billion, nine hundred ninety-three million, eight hundred twenty-two thousand, four hundred ninety-one".