12721324 has 48 divisors (see below), whose sum is σ = 28094976. Its totient is φ = 4896000.

The previous prime is 12721273. The next prime is 12721333. The reversal of 12721324 is 42312721.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 12721295 and 12721304.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31524 + ... + 31924.

It is an arithmetic number, because the mean of its divisors is an integer number (585312).

Almost surely, 2^12721324 is an apocalyptic number.

12721324 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12721324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14047488).

12721324 is an abundant number, since it is smaller than the sum of its proper divisors (15373652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12721324 is a wasteful number, since it uses less digits than its factorization.

12721324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 524 counting only the distinct ones).

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

The square root of 12721324 is about 3566.6965107786. The cubic root of 12721324 is about 233.4411628599.

The spelling of 12721324 in words is "twelve million, seven hundred twenty-one thousand, three hundred twenty-four".