2021001001091 has 2 divisors, whose sum is σ = 2021001001092. Its totient is φ = 2021001001090.

The previous prime is 2021001001031. The next prime is 2021001001121. The reversal of 2021001001091 is 1901001001202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021001001091 - 2¹⁴ = 2021000984707 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021001001031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010500500545 + 1010500500546.

It is an arithmetic number, because the mean of its divisors is an integer number (1010500500546).

Almost surely, 2^{2021001001091} is an apocalyptic number.

2021001001091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021001001091 is an equidigital number, since it uses as much as digits as its factorization.

2021001001091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 2021001001091 its reverse (1901001001202), we get a palindrome (3922002002293).

The spelling of 2021001001091 in words is "two trillion, twenty-one billion, one million, one thousand, ninety-one".