2021002000091 has 2 divisors, whose sum is σ = 2021002000092. Its totient is φ = 2021002000090.

The previous prime is 2021002000079. The next prime is 2021002000111. The reversal of 2021002000091 is 1900002001202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021002000091 - 2¹⁸ = 2021001737947 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021002000001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010501000045 + 1010501000046.

It is an arithmetic number, because the mean of its divisors is an integer number (1010501000046).

Almost surely, 2^{2021002000091} is an apocalyptic number.

2021002000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021002000091 is an equidigital number, since it uses as much as digits as its factorization.

2021002000091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 2021002000091 its reverse (1900002001202), we get a palindrome (3921004001293).

The spelling of 2021002000091 in words is "two trillion, twenty-one billion, two million, ninety-one", and thus it is an aban number and an uban number.