1001122120091 has 4 divisors (see below), whose sum is σ = 1001181476784. Its totient is φ = 1001062763400.

The previous prime is 1001122120057. The next prime is 1001122120181. The reversal of 1001122120091 is 1900212211001.

1001122120091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1001122120091 - 2³⁸ = 726244213147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001122120391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29653040 + ... + 29686781.

It is an arithmetic number, because the mean of its divisors is an integer number (250295369196).

Almost surely, 2^{1001122120091} is an apocalyptic number.

1001122120091 is a deficient number, since it is larger than the sum of its proper divisors (59356693).

1001122120091 is an equidigital number, since it uses as much as digits as its factorization.

1001122120091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59356692.

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

Adding to 1001122120091 its reverse (1900212211001), we get a palindrome (2901334331092).

The spelling of 1001122120091 in words is "one trillion, one billion, one hundred twenty-two million, one hundred twenty thousand, ninety-one".