12042221 has 8 divisors (see below), whose sum is σ = 12610080. Its totient is φ = 11484592.

The previous prime is 12042197. The next prime is 12042241. The reversal of 12042221 is 12224021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12042221 - 2⁶ = 12042157 is a prime.

It is a super-2 number, since 2×12042221² = 290030173225682, which contains 22 as substring.

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 = 12042196 and 12042205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12042241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95 + ... + 4908.

It is an arithmetic number, because the mean of its divisors is an integer number (1576260).

Almost surely, 2^12042221 is an apocalyptic number.

It is an amenable number.

12042221 is a deficient number, since it is larger than the sum of its proper divisors (567859).

12042221 is an equidigital number, since it uses as much as digits as its factorization.

12042221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5115.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 12042221 is about 3470.1903406009. The cubic root of 12042221 is about 229.2110396647.

Adding to 12042221 its reverse (12224021), we get a palindrome (24266242).

The spelling of 12042221 in words is "twelve million, forty-two thousand, two hundred twenty-one".