12654221 has 2 divisors, whose sum is σ = 12654222. Its totient is φ = 12654220.

The previous prime is 12654157. The next prime is 12654241. The reversal of 12654221 is 12245621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11356900 + 1297321 = 3370^2 + 1139^2 .

It is an emirp because it is prime and its reverse (12245621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12654221 - 2⁶ = 12654157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12654241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6327110 + 6327111.

It is an arithmetic number, because the mean of its divisors is an integer number (6327111).

Almost surely, 2^12654221 is an apocalyptic number.

It is an amenable number.

12654221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12654221 is an equidigital number, since it uses as much as digits as its factorization.

12654221 is an evil number, because the sum of its binary digits is even.

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

The square root of 12654221 is about 3557.2771890872. The cubic root of 12654221 is about 233.0299838000.

Adding to 12654221 its reverse (12245621), we get a palindrome (24899842).

The spelling of 12654221 in words is "twelve million, six hundred fifty-four thousand, two hundred twenty-one".