11222112121 has 16 divisors (see below), whose sum is σ = 12626627328. Its totient is φ = 9885952000.

The previous prime is 11222112071. The next prime is 11222112157. The reversal of 11222112121 is 12121122211.

It is a cyclic number.

It is not a de Polignac number, because 11222112121 - 2⁷ = 11222111993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11222112095 and 11222112104.

It is not an unprimeable number, because it can be changed into a prime (11222112191) 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, 55240 + ... + 159673.

It is an arithmetic number, because the mean of its divisors is an integer number (789164208).

Almost surely, 2^11222112121 is an apocalyptic number.

11222112121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11222112121 is a deficient number, since it is larger than the sum of its proper divisors (1404515207).

11222112121 is a wasteful number, since it uses less digits than its factorization.

11222112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215072.

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

Adding to 11222112121 its reverse (12121122211), we get a palindrome (23343234332).

The spelling of 11222112121 in words is "eleven billion, two hundred twenty-two million, one hundred twelve thousand, one hundred twenty-one".