2011210120091 has 2 divisors, whose sum is σ = 2011210120092. Its totient is φ = 2011210120090.

The previous prime is 2011210120081. The next prime is 2011210120093. The reversal of 2011210120091 is 1900210121102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011210120091 is a prime.

It is a super-2 number, since 2×2011210120091² (a number of 25 digits) contains 22 as substring.

Together with 2011210120093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2011210120093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005605060045 + 1005605060046.

It is an arithmetic number, because the mean of its divisors is an integer number (1005605060046).

Almost surely, 2^{2011210120091} is an apocalyptic number.

2011210120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011210120091 is an equidigital number, since it uses as much as digits as its factorization.

2011210120091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 2011210120091 its reverse (1900210121102), we get a palindrome (3911420241193).

The spelling of 2011210120091 in words is "two trillion, eleven billion, two hundred ten million, one hundred twenty thousand, ninety-one".