11213221211 has 16 divisors (see below), whose sum is σ = 11892172800. Its totient is φ = 10551217248.

The previous prime is 11213221207. The next prime is 11213221213. The reversal of 11213221211 is 11212231211.

It is a happy number.

It is not a de Polignac number, because 11213221211 - 2² = 11213221207 is a prime.

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 11213221211.

It is not an unprimeable number, because it can be changed into a prime (11213221213) 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, 492170 + ... + 514448.

It is an arithmetic number, because the mean of its divisors is an integer number (743260800).

Almost surely, 2^11213221211 is an apocalyptic number.

11213221211 is a deficient number, since it is larger than the sum of its proper divisors (678951589).

11213221211 is a wasteful number, since it uses less digits than its factorization.

11213221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22658.

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

Adding to 11213221211 its reverse (11212231211), we get a palindrome (22425452422).

The spelling of 11213221211 in words is "eleven billion, two hundred thirteen million, two hundred twenty-one thousand, two hundred eleven".