11431201321 has 4 divisors (see below), whose sum is σ = 11431422292. Its totient is φ = 11430980352.

The previous prime is 11431201297. The next prime is 11431201339. The reversal of 11431201321 is 12310213411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12310213411 = 19 ⋅647905969.

It can be written as a sum of positive squares in 2 ways, for example, as 4305984400 + 7125216921 = 65620^2 + 84411^2 .

It is a cyclic number.

It is not a de Polignac number, because 11431201321 - 2⁵ = 11431201289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11431201351) 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, 13465 + ... + 151801.

It is an arithmetic number, because the mean of its divisors is an integer number (2857855573).

Almost surely, 2^11431201321 is an apocalyptic number.

It is an amenable number.

11431201321 is a deficient number, since it is larger than the sum of its proper divisors (220971).

11431201321 is an equidigital number, since it uses as much as digits as its factorization.

11431201321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220970.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 11431201321 its reverse (12310213411), we get a palindrome (23741414732).

The spelling of 11431201321 in words is "eleven billion, four hundred thirty-one million, two hundred one thousand, three hundred twenty-one".