12473221 has 2 divisors, whose sum is σ = 12473222. Its totient is φ = 12473220.

The previous prime is 12473213. The next prime is 12473233. The reversal of 12473221 is 12237421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12460900 + 12321 = 3530^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 12473221 - 2³ = 12473213 is a prime.

It is a super-2 number, since 2×12473221² = 311162484229682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12473192 and 12473201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12473281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6236610 + 6236611.

It is an arithmetic number, because the mean of its divisors is an integer number (6236611).

Almost surely, 2^12473221 is an apocalyptic number.

It is an amenable number.

12473221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12473221 is an equidigital number, since it uses as much as digits as its factorization.

12473221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 22.

The square root of 12473221 is about 3531.7447529514. The cubic root of 12473221 is about 231.9135937146.

The spelling of 12473221 in words is "twelve million, four hundred seventy-three thousand, two hundred twenty-one".