11003431321 has 4 divisors (see below), whose sum is σ = 11005924644. Its totient is φ = 11000938000.

The previous prime is 11003431267. The next prime is 11003431331. The reversal of 11003431321 is 12313430011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12313430011 = 25603 ⋅480937.

It can be written as a sum of positive squares in 2 ways, for example, as 3331598400 + 7671832921 = 57720^2 + 87589^2 .

It is a cyclic number.

It is not a de Polignac number, because 11003431321 - 2¹¹ = 11003429273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11003431331) 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, 1240030 + ... + 1248871.

It is an arithmetic number, because the mean of its divisors is an integer number (2751481161).

Almost surely, 2^11003431321 is an apocalyptic number.

It is an amenable number.

11003431321 is a deficient number, since it is larger than the sum of its proper divisors (2493323).

11003431321 is an equidigital number, since it uses as much as digits as its factorization.

11003431321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493322.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 11003431321 its reverse (12313430011), we get a palindrome (23316861332).

The spelling of 11003431321 in words is "eleven billion, three million, four hundred thirty-one thousand, three hundred twenty-one".