11112222121 has 16 divisors (see below), whose sum is σ = 14919907968. Its totient is φ = 7992806400.

The previous prime is 11112222119. The next prime is 11112222151. The reversal of 11112222121 is 12122221111.

11112222121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11112222121 - 2¹ = 11112222119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11112222095 and 11112222104.

It is not an unprimeable number, because it can be changed into a prime (11112222151) 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, 5549560 + ... + 5551561.

It is an arithmetic number, because the mean of its divisors is an integer number (932494248).

Almost surely, 2^11112222121 is an apocalyptic number.

11112222121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11112222121 is a deficient number, since it is larger than the sum of its proper divisors (3807685847).

11112222121 is a wasteful number, since it uses less digits than its factorization.

11112222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11101152.

The product of its digits is 32, while the sum is 16.

Adding to 11112222121 its reverse (12122221111), we get a palindrome (23234443232).

The spelling of 11112222121 in words is "eleven billion, one hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".