12721234 has 8 divisors (see below), whose sum is σ = 19547388. Its totient is φ = 6205440.

The previous prime is 12721217. The next prime is 12721271. The reversal of 12721234 is 43212721.

It can be written as a sum of positive squares in 2 ways, for example, as 7868025 + 4853209 = 2805^2 + 2203^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77487 + ... + 77650.

Almost surely, 2^12721234 is an apocalyptic number.

12721234 is a deficient number, since it is larger than the sum of its proper divisors (6826154).

12721234 is a wasteful number, since it uses less digits than its factorization.

12721234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155180.

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

The square root of 12721234 is about 3566.6838940394. The cubic root of 12721234 is about 233.4406123471.

Adding to 12721234 its reverse (43212721), we get a palindrome (55933955).

The spelling of 12721234 in words is "twelve million, seven hundred twenty-one thousand, two hundred thirty-four".