2011021011091 has 4 divisors (see below), whose sum is σ = 2024339031184. Its totient is φ = 1997702991000.

The previous prime is 2011021011079. The next prime is 2011021011133. The reversal of 2011021011091 is 1901101201102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2011021011091 - 2⁷ = 2011021010963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011021011001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6659009820 + ... + 6659010121.

It is an arithmetic number, because the mean of its divisors is an integer number (506084757796).

Almost surely, 2^{2011021011091} is an apocalyptic number.

2011021011091 is a deficient number, since it is larger than the sum of its proper divisors (13318020093).

2011021011091 is a wasteful number, since it uses less digits than its factorization.

2011021011091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13318020092.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 2011021011091 its reverse (1901101201102), we get a palindrome (3912122212193).

The spelling of 2011021011091 in words is "two trillion, eleven billion, twenty-one million, eleven thousand, ninety-one".