12733721 has 16 divisors (see below), whose sum is σ = 17098368. Its totient is φ = 9158400.

The previous prime is 12733703. The next prime is 12733729.

12733721 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12733721 - 2¹⁰ = 12732697 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12733729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5360 + ... + 7361.

It is an arithmetic number, because the mean of its divisors is an integer number (1068648).

Almost surely, 2^12733721 is an apocalyptic number.

12733721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12733721 is a deficient number, since it is larger than the sum of its proper divisors (4364647).

12733721 is a wasteful number, since it uses less digits than its factorization.

12733721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12752.

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

The square root of 12733721 is about 3568.4339702452. The cubic root of 12733721 is about 233.5169681387.

It can be divided in two parts, 1273 and 3721, that added together give a palindrome (4994).

The spelling of 12733721 in words is "twelve million, seven hundred thirty-three thousand, seven hundred twenty-one".