12011121 has 6 divisors (see below), whose sum is σ = 17349410. Its totient is φ = 8007408.

The previous prime is 12011117. The next prime is 12011123. The reversal of 12011121 is 12111021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 314721 = 3420^2 + 561^2 .

It is not a de Polignac number, because 12011121 - 2² = 12011117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1334569 = 12011121 / (1 + 2 + 0 + 1 + 1 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011123) 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 5 ways as a sum of consecutive naturals, for example, 667276 + ... + 667293.

Almost surely, 2^12011121 is an apocalyptic number.

It is an amenable number.

12011121 is a deficient number, since it is larger than the sum of its proper divisors (5338289).

12011121 is a wasteful number, since it uses less digits than its factorization.

12011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334575 (or 1334572 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 12011121 is about 3465.7064214962. The cubic root of 12011121 is about 229.0135509356.

Adding to 12011121 its reverse (12111021), we get a palindrome (24122142).

The spelling of 12011121 in words is "twelve million, eleven thousand, one hundred twenty-one".