12546221 has 8 divisors (see below), whose sum is σ = 13323384. Its totient is φ = 11773440.

The previous prime is 12546211. The next prime is 12546229. The reversal of 12546221 is 12264521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 198025 + 12348196 = 445^2 + 3514^2 .

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 12546221 - 2¹⁴ = 12529837 is a prime.

It is a super-2 number, since 2×12546221² = 314815322761682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12546229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6281 + ... + 8033.

It is an arithmetic number, because the mean of its divisors is an integer number (1665423).

Almost surely, 2^12546221 is an apocalyptic number.

It is an amenable number.

12546221 is a deficient number, since it is larger than the sum of its proper divisors (777163).

12546221 is a wasteful number, since it uses less digits than its factorization.

12546221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191.

The product of its digits is 960, while the sum is 23.

The square root of 12546221 is about 3542.0645109879. The cubic root of 12546221 is about 232.3651416637.

The spelling of 12546221 in words is "twelve million, five hundred forty-six thousand, two hundred twenty-one".