11222121 has 4 divisors (see below), whose sum is σ = 14962832. Its totient is φ = 7481412.

The previous prime is 11222089. The next prime is 11222129. The reversal of 11222121 is 12122211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12122211 = 3 ⋅4040737.

It is not a de Polignac number, because 11222121 - 2⁵ = 11222089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11222097 and 11222106.

It is not an unprimeable number, because it can be changed into a prime (11222129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1870351 + ... + 1870356.

It is an arithmetic number, because the mean of its divisors is an integer number (3740708).

Almost surely, 2^11222121 is an apocalyptic number.

It is an amenable number.

11222121 is a deficient number, since it is larger than the sum of its proper divisors (3740711).

11222121 is an equidigital number, since it uses as much as digits as its factorization.

11222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3740710.

The product of its digits is 16, while the sum is 12.

The square root of 11222121 is about 3349.9434323582. The cubic root of 11222121 is about 223.8849922481.

Adding to 11222121 its reverse (12122211), we get a palindrome (23344332).

The spelling of 11222121 in words is "eleven million, two hundred twenty-two thousand, one hundred twenty-one".