12061221 has 4 divisors (see below), whose sum is σ = 16081632. Its totient is φ = 8040812.

The previous prime is 12061213. The next prime is 12061237. The reversal of 12061221 is 12216021.

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: 12216021 = 3 ⋅4072007.

It is a cyclic number.

It is not a de Polignac number, because 12061221 - 2³ = 12061213 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12061221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12061261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2010201 + ... + 2010206.

It is an arithmetic number, because the mean of its divisors is an integer number (4020408).

Almost surely, 2^12061221 is an apocalyptic number.

It is an amenable number.

12061221 is a deficient number, since it is larger than the sum of its proper divisors (4020411).

12061221 is an equidigital number, since it uses as much as digits as its factorization.

12061221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020410.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 12061221 is about 3472.9268636123. The cubic root of 12061221 is about 229.3315246744.

Adding to 12061221 its reverse (12216021), we get a palindrome (24277242).

The spelling of 12061221 in words is "twelve million, sixty-one thousand, two hundred twenty-one".