2021210202091 has 2 divisors, whose sum is σ = 2021210202092. Its totient is φ = 2021210202090.

The previous prime is 2021210202079. The next prime is 2021210202113. The reversal of 2021210202091 is 1902020121202.

It is an a-pointer prime, because the next prime (2021210202113) can be obtained adding 2021210202091 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021210202091 - 2²¹ = 2021208104939 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021210202031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010605101045 + 1010605101046.

It is an arithmetic number, because the mean of its divisors is an integer number (1010605101046).

Almost surely, 2^{2021210202091} is an apocalyptic number.

2021210202091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021210202091 is an equidigital number, since it uses as much as digits as its factorization.

2021210202091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 2021210202091 its reverse (1902020121202), we get a palindrome (3923230323293).

The spelling of 2021210202091 in words is "two trillion, twenty-one billion, two hundred ten million, two hundred two thousand, ninety-one".