11121212211 has 16 divisors (see below), whose sum is σ = 15720311808. Its totient is φ = 6981055200.

The previous prime is 11121212197. The next prime is 11121212243. The reversal of 11121212211 is 11221212111.

It is a happy number.

11121212211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11121212211 - 2¹³ = 11121204019 is a prime.

It is a super-2 number, since 2×11121212211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11121212251) 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 15 ways as a sum of consecutive naturals, for example, 1612545 + ... + 1619426.

It is an arithmetic number, because the mean of its divisors is an integer number (982519488).

Almost surely, 2^11121212211 is an apocalyptic number.

11121212211 is a deficient number, since it is larger than the sum of its proper divisors (4599099597).

11121212211 is a wasteful number, since it uses less digits than its factorization.

11121212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3232042.

The product of its digits is 16, while the sum is 15.

Adding to 11121212211 its reverse (11221212111), we get a palindrome (22342424322).

The spelling of 11121212211 in words is "eleven billion, one hundred twenty-one million, two hundred twelve thousand, two hundred eleven".