11213013221 has 4 divisors (see below), whose sum is σ = 11872602252. Its totient is φ = 10553424192.

The previous prime is 11213013209. The next prime is 11213013223. The reversal of 11213013221 is 12231031211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12231031211 = 7 ⋅1747290173.

It can be written as a sum of positive squares in 2 ways, for example, as 8793750625 + 2419262596 = 93775^2 + 49186^2 .

It is a cyclic number.

It is not a de Polignac number, because 11213013221 - 2⁶ = 11213013157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 659589013 = 11213013221 / (1 + 1 + 2 + 1 + 3 + 0 + 1 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11213013221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213013223) 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, 329794490 + ... + 329794523.

It is an arithmetic number, because the mean of its divisors is an integer number (2968150563).

Almost surely, 2^11213013221 is an apocalyptic number.

It is an amenable number.

11213013221 is a deficient number, since it is larger than the sum of its proper divisors (659589031).

11213013221 is an equidigital number, since it uses as much as digits as its factorization.

11213013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659589030.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11213013221 its reverse (12231031211), we get a palindrome (23444044432).

The spelling of 11213013221 in words is "eleven billion, two hundred thirteen million, thirteen thousand, two hundred twenty-one".