11121231109 has 8 divisors (see below), whose sum is σ = 11167216632. Its totient is φ = 11075332800.

The previous prime is 11121231103. The next prime is 11121231151. The reversal of 11121231109 is 90113212111.

It can be written as a sum of positive squares in 4 ways, for example, as 2748066084 + 8373165025 = 52422^2 + 91505^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11121231109 - 2¹⁷ = 11121100037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11121231109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121231103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240207 + ... + 282739.

It is an arithmetic number, because the mean of its divisors is an integer number (1395902079).

Almost surely, 2^11121231109 is an apocalyptic number.

It is an amenable number.

11121231109 is a deficient number, since it is larger than the sum of its proper divisors (45985523).

11121231109 is an equidigital number, since it uses as much as digits as its factorization.

11121231109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43607.

The product of its (nonzero) digits is 108, while the sum is 22.

The spelling of 11121231109 in words is "eleven billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred nine".