11123191321 has 12 divisors (see below), whose sum is σ = 12261000276. Its totient is φ = 10083307520.

The previous prime is 11123191297. The next prime is 11123191333. The reversal of 11123191321 is 12319132111.

It can be written as a sum of positive squares in 2 ways, for example, as 5488587225 + 5634604096 = 74085^2 + 75064^2 .

It is not a de Polignac number, because 11123191321 - 2¹⁹ = 11122667033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11123191351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87496 + ... + 172921.

It is an arithmetic number, because the mean of its divisors is an integer number (1021750023).

Almost surely, 2^11123191321 is an apocalyptic number.

11123191321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11123191321 is a deficient number, since it is larger than the sum of its proper divisors (1137808955).

11123191321 is a wasteful number, since it uses less digits than its factorization.

11123191321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260792 (or 260781 counting only the distinct ones).

The product of its digits is 324, while the sum is 25.

The spelling of 11123191321 in words is "eleven billion, one hundred twenty-three million, one hundred ninety-one thousand, three hundred twenty-one".