2021010000091 has 2 divisors, whose sum is σ = 2021010000092. Its totient is φ = 2021010000090.

The previous prime is 2021010000047. The next prime is 2021010000127. The reversal of 2021010000091 is 1900000101202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021010000091 - 2²⁵ = 2020976445659 is a prime.

It is a super-3 number, since 3×2021010000091³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2021010007091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010505000045 + 1010505000046.

It is an arithmetic number, because the mean of its divisors is an integer number (1010505000046).

Almost surely, 2^{2021010000091} is an apocalyptic number.

2021010000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021010000091 is an equidigital number, since it uses as much as digits as its factorization.

2021010000091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 2021010000091 its reverse (1900000101202), we get a palindrome (3921010101293).

The spelling of 2021010000091 in words is "two trillion, twenty-one billion, ten million, ninety-one", and thus it is an aban number and an uban number.