12721733 has 4 divisors (see below), whose sum is σ = 12930348. Its totient is φ = 12513120.

The previous prime is 12721721. The next prime is 12721739. The reversal of 12721733 is 33712721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33712721 = 7 ⋅4816103.

It can be written as a sum of positive squares in 2 ways, for example, as 2211169 + 10510564 = 1487^2 + 3242^2 .

It is a cyclic number.

It is not a de Polignac number, because 12721733 - 2⁸ = 12721477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104216 + ... + 104337.

It is an arithmetic number, because the mean of its divisors is an integer number (3232587).

Almost surely, 2^12721733 is an apocalyptic number.

It is an amenable number.

12721733 is a deficient number, since it is larger than the sum of its proper divisors (208615).

12721733 is an equidigital number, since it uses as much as digits as its factorization.

12721733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208614.

The product of its digits is 1764, while the sum is 26.

The square root of 12721733 is about 3566.7538462866. The cubic root of 12721733 is about 233.4436646019.

The spelling of 12721733 in words is "twelve million, seven hundred twenty-one thousand, seven hundred thirty-three".