2021201011891 has 2 divisors, whose sum is σ = 2021201011892. Its totient is φ = 2021201011890.

The previous prime is 2021201011877. The next prime is 2021201011919. The reversal of 2021201011891 is 1981101021202.

It is an a-pointer prime, because the next prime (2021201011919) can be obtained adding 2021201011891 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021201011891 - 2¹¹ = 2021201009843 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021201018891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010600505945 + 1010600505946.

It is an arithmetic number, because the mean of its divisors is an integer number (1010600505946).

Almost surely, 2^{2021201011891} is an apocalyptic number.

2021201011891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021201011891 is an equidigital number, since it uses as much as digits as its factorization.

2021201011891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 2021201011891 in words is "two trillion, twenty-one billion, two hundred one million, eleven thousand, eight hundred ninety-one".