11100990121 has 4 divisors (see below), whose sum is σ = 11954912452. Its totient is φ = 10247067792.

The previous prime is 11100990119. The next prime is 11100990133. The reversal of 11100990121 is 12109900111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3458733721 + 7642256400 = 58811^2 + 87420^2 .

It is not a de Polignac number, because 11100990121 - 2¹ = 11100990119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11100900121) 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, 426961146 + ... + 426961171.

It is an arithmetic number, because the mean of its divisors is an integer number (2988728113).

Almost surely, 2^11100990121 is an apocalyptic number.

It is an amenable number.

11100990121 is a deficient number, since it is larger than the sum of its proper divisors (853922331).

11100990121 is an equidigital number, since it uses as much as digits as its factorization.

11100990121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853922330.

The product of its (nonzero) digits is 162, while the sum is 25.

The spelling of 11100990121 in words is "eleven billion, one hundred million, nine hundred ninety thousand, one hundred twenty-one".