12821138 has 16 divisors (see below), whose sum is σ = 21469536. Its totient is φ = 5691840.

The previous prime is 12821119. The next prime is 12821141. The reversal of 12821138 is 83112821.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5831 + ... + 7722.

It is an arithmetic number, because the mean of its divisors is an integer number (1341846).

Almost surely, 2^12821138 is an apocalyptic number.

12821138 is a deficient number, since it is larger than the sum of its proper divisors (8648398).

12821138 is a wasteful number, since it uses less digits than its factorization.

12821138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13609.

The product of its digits is 768, while the sum is 26.

The square root of 12821138 is about 3580.6616706972. The cubic root of 12821138 is about 234.0501146712.

Adding to 12821138 its reverse (83112821), we get a palindrome (95933959).

The spelling of 12821138 in words is "twelve million, eight hundred twenty-one thousand, one hundred thirty-eight".