13221021111 has 16 divisors (see below), whose sum is σ = 18118349280. Its totient is φ = 8572101120.

The previous prime is 13221021109. The next prime is 13221021133. The reversal of 13221021111 is 11112012231.

It is not a de Polignac number, because 13221021111 - 2¹ = 13221021109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221026111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389590 + ... + 422163.

It is an arithmetic number, because the mean of its divisors is an integer number (1132396830).

Almost surely, 2^13221021111 is an apocalyptic number.

13221021111 is a deficient number, since it is larger than the sum of its proper divisors (4897328169).

13221021111 is an equidigital number, since it uses as much as digits as its factorization.

13221021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811906.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 13221021111 its reverse (11112012231), we get a palindrome (24333033342).

The spelling of 13221021111 in words is "thirteen billion, two hundred twenty-one million, twenty-one thousand, one hundred eleven".