12001121 has 16 divisors (see below), whose sum is σ = 13547520. Its totient is φ = 10537680.

The previous prime is 12001117. The next prime is 12001139. The reversal of 12001121 is 12110021.

It is a cyclic number.

It is not a de Polignac number, because 12001121 - 2² = 12001117 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 = 12001099 and 12001108.

It is not an unprimeable number, because it can be changed into a prime (12001111) 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, 71780 + ... + 71946.

It is an arithmetic number, because the mean of its divisors is an integer number (846720).

Almost surely, 2^12001121 is an apocalyptic number.

12001121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12001121 is a deficient number, since it is larger than the sum of its proper divisors (1546399).

12001121 is a wasteful number, since it uses less digits than its factorization.

12001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 12001121 is about 3464.2634137721. The cubic root of 12001121 is about 228.9499773146.

Adding to 12001121 its reverse (12110021), we get a palindrome (24111142).

Subtracting 12001121 from its reverse (12110021), we obtain a square (108900 = 330²).

The spelling of 12001121 in words is "twelve million, one thousand, one hundred twenty-one".