12010221 has 16 divisors (see below), whose sum is σ = 17867520. Its totient is φ = 7973280.

The previous prime is 12010199. The next prime is 12010241. The reversal of 12010221 is 12201021.

12010221 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 12010221 - 2⁵ = 12010189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12010241) 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, 6796 + ... + 8378.

It is an arithmetic number, because the mean of its divisors is an integer number (1116720).

Almost surely, 2^12010221 is an apocalyptic number.

It is an amenable number.

12010221 is a deficient number, since it is larger than the sum of its proper divisors (5857299).

12010221 is a wasteful number, since it uses less digits than its factorization.

12010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873 (or 1867 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 12010221 is about 3465.5765754056. The cubic root of 12010221 is about 229.0078307550.

Adding to 12010221 its reverse (12201021), we get a palindrome (24211242).

The spelling of 12010221 in words is "twelve million, ten thousand, two hundred twenty-one".