2001220020091 has 2 divisors, whose sum is σ = 2001220020092. Its totient is φ = 2001220020090.

The previous prime is 2001220020077. The next prime is 2001220020109. The reversal of 2001220020091 is 1900200221002.

Together with next prime (2001220020109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001220020091 - 2⁷ = 2001220019963 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001220920091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610010045 + 1000610010046.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610010046).

Almost surely, 2^{2001220020091} is an apocalyptic number.

2001220020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001220020091 is an equidigital number, since it uses as much as digits as its factorization.

2001220020091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2001220020091 its reverse (1900200221002), we get a palindrome (3901420241093).

The spelling of 2001220020091 in words is "two trillion, one billion, two hundred twenty million, twenty thousand, ninety-one".