12721332 has 24 divisors (see below), whose sum is σ = 31966816. Its totient is φ = 3914208.

The previous prime is 12721273. The next prime is 12721333. The reversal of 12721332 is 23312721.

It is a junction number, because it is equal to n+sod(n) for n = 12721299 and 12721308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40618 + ... + 40929.

Almost surely, 2^12721332 is an apocalyptic number.

12721332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12721332 is an abundant number, since it is smaller than the sum of its proper divisors (19245484).

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

12721332 is a wasteful number, since it uses less digits than its factorization.

12721332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81567 (or 81565 counting only the distinct ones).

The product of its digits is 504, while the sum is 21.

The square root of 12721332 is about 3566.6976322643. The cubic root of 12721332 is about 233.4412117942.

The spelling of 12721332 in words is "twelve million, seven hundred twenty-one thousand, three hundred thirty-two".