11122121 has 4 divisors (see below), whose sum is σ = 11180544. Its totient is φ = 11063700.

The previous prime is 11122099. The next prime is 11122129. The reversal of 11122121 is 12122111.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11122121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11122129) 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, 28925 + ... + 29306.

It is an arithmetic number, because the mean of its divisors is an integer number (2795136).

Almost surely, 2^11122121 is an apocalyptic number.

It is an amenable number.

11122121 is a deficient number, since it is larger than the sum of its proper divisors (58423).

11122121 is an equidigital number, since it uses as much as digits as its factorization.

11122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58422.

The product of its digits is 8, while the sum is 11.

The square root of 11122121 is about 3334.9844077597. The cubic root of 11122121 is about 223.2179961873.

Adding to 11122121 its reverse (12122111), we get a palindrome (23244232).

The spelling of 11122121 in words is "eleven million, one hundred twenty-two thousand, one hundred twenty-one".