12829221 has 6 divisors (see below), whose sum is σ = 18531110. Its totient is φ = 8552808.

The previous prime is 12829217. The next prime is 12829247. The reversal of 12829221 is 12292821.

It can be written as a sum of positive squares in only one way, i.e., 12173121 + 656100 = 3489^2 + 810^2 .

It is not a de Polignac number, because 12829221 - 2² = 12829217 is a prime.

It is a super-2 number, since 2×12829221² = 329177822933682, 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 (12829211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 712726 + ... + 712743.

Almost surely, 2^12829221 is an apocalyptic number.

It is an amenable number.

12829221 is a deficient number, since it is larger than the sum of its proper divisors (5701889).

12829221 is a wasteful number, since it uses less digits than its factorization.

12829221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425475 (or 1425472 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 12829221 is about 3581.7901948607. The cubic root of 12829221 is about 234.0992894443.

The spelling of 12829221 in words is "twelve million, eight hundred twenty-nine thousand, two hundred twenty-one".