12421256 has 8 divisors (see below), whose sum is σ = 23289870. Its totient is φ = 6210624.

The previous prime is 12421243. The next prime is 12421261. The reversal of 12421256 is 65212421.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9302500 + 3118756 = 3050^2 + 1766^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776321 + ... + 776336.

Almost surely, 2^12421256 is an apocalyptic number.

It is an amenable number.

12421256 is a deficient number, since it is larger than the sum of its proper divisors (10868614).

12421256 is a wasteful number, since it uses less digits than its factorization.

12421256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552663 (or 1552659 counting only the distinct ones).

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

The square root of 12421256 is about 3524.3802292034. The cubic root of 12421256 is about 231.5910850750.

Adding to 12421256 its reverse (65212421), we get a palindrome (77633677).

The spelling of 12421256 in words is "twelve million, four hundred twenty-one thousand, two hundred fifty-six".