11431130321 has 4 divisors (see below), whose sum is σ = 12310448052. Its totient is φ = 10551812592.

The previous prime is 11431130297. The next prime is 11431130323. The reversal of 11431130321 is 12303113411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12303113411 = 6397 ⋅1923263.

It can be written as a sum of positive squares in 2 ways, for example, as 6047239696 + 5383890625 = 77764^2 + 73375^2 .

It is a cyclic number.

It is not a de Polignac number, because 11431130321 - 2¹⁸ = 11430868177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11431130293 and 11431130302.

It is not an unprimeable number, because it can be changed into a prime (11431130323) 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, 439658846 + ... + 439658871.

It is an arithmetic number, because the mean of its divisors is an integer number (3077612013).

Almost surely, 2^11431130321 is an apocalyptic number.

It is an amenable number.

11431130321 is a deficient number, since it is larger than the sum of its proper divisors (879317731).

11431130321 is an equidigital number, since it uses as much as digits as its factorization.

11431130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879317730.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 11431130321 its reverse (12303113411), we get a palindrome (23734243732).

The spelling of 11431130321 in words is "eleven billion, four hundred thirty-one million, one hundred thirty thousand, three hundred twenty-one".