12326721 has 16 divisors (see below), whose sum is σ = 18102528. Its totient is φ = 7398800.

The previous prime is 12326719. The next prime is 12326729. The reversal of 12326721 is 12762321.

It is a cyclic number.

It is not a de Polignac number, because 12326721 - 2¹ = 12326719 is a prime.

It is a super-2 number, since 2×12326721² = 303896101223682, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12326691 and 12326700.

It is not an unprimeable number, because it can be changed into a prime (12326729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1786 + ... + 5276.

It is an arithmetic number, because the mean of its divisors is an integer number (1131408).

Almost surely, 2^12326721 is an apocalyptic number.

12326721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12326721 is a deficient number, since it is larger than the sum of its proper divisors (5775807).

12326721 is a wasteful number, since it uses less digits than its factorization.

12326721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3612.

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

The square root of 12326721 is about 3510.9430357099. The cubic root of 12326721 is about 231.0020614122.

Subtracting 12326721 from its reverse (12762321), we obtain a square (435600 = 660²).

The spelling of 12326721 in words is "twelve million, three hundred twenty-six thousand, seven hundred twenty-one".