12236721 has 12 divisors (see below), whose sum is σ = 18979632. Its totient is φ = 6992328.

The previous prime is 12236701. The next prime is 12236743. The reversal of 12236721 is 12763221.

It is not a de Polignac number, because 12236721 - 2⁵ = 12236689 is a prime.

It is a zygodrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 12236691 and 12236700.

It is not an unprimeable number, because it can be changed into a prime (12236701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41475 + ... + 41768.

It is an arithmetic number, because the mean of its divisors is an integer number (1581636).

Almost surely, 2^12236721 is an apocalyptic number.

It is an amenable number.

12236721 is a deficient number, since it is larger than the sum of its proper divisors (6742911).

12236721 is an equidigital number, since it uses as much as digits as its factorization.

12236721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83260 (or 83253 counting only the distinct ones).

The product of its digits is 1008, while the sum is 24.

The square root of 12236721 is about 3498.1024856342. The cubic root of 12236721 is about 230.4384892718.

Adding to 12236721 its reverse (12763221), we get a palindrome (24999942).

The spelling of 12236721 in words is "twelve million, two hundred thirty-six thousand, seven hundred twenty-one".