11431221011 has 4 divisors (see below), whose sum is σ = 13064252592. Its totient is φ = 9798189432.

The previous prime is 11431221001. The next prime is 11431221059. The reversal of 11431221011 is 11012213411.

11431221011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11431221011 - 2¹⁴ = 11431204627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11431221001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816515780 + ... + 816515793.

It is an arithmetic number, because the mean of its divisors is an integer number (3266063148).

Almost surely, 2^11431221011 is an apocalyptic number.

11431221011 is a deficient number, since it is larger than the sum of its proper divisors (1633031581).

11431221011 is an equidigital number, since it uses as much as digits as its factorization.

11431221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633031580.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 11431221011 its reverse (11012213411), we get a palindrome (22443434422).

The spelling of 11431221011 in words is "eleven billion, four hundred thirty-one million, two hundred twenty-one thousand, eleven".