12755721 has 8 divisors (see below), whose sum is σ = 18553824. Its totient is φ = 7730720.

The previous prime is 12755693. The next prime is 12755723.

12755721 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12755721 - 2⁶ = 12755657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12755723) 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, 193236 + ... + 193301.

It is an arithmetic number, because the mean of its divisors is an integer number (2319228).

Almost surely, 2^12755721 is an apocalyptic number.

12755721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12755721 is a deficient number, since it is larger than the sum of its proper divisors (5798103).

12755721 is a wasteful number, since it uses less digits than its factorization.

12755721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386551.

The product of its digits is 4900, while the sum is 30.

The square root of 12755721 is about 3571.5152246631. The cubic root of 12755721 is about 233.6513728826.

It can be divided in two parts, 1275 and 5721, that added together give a palindrome (6996).

The spelling of 12755721 in words is "twelve million, seven hundred fifty-five thousand, seven hundred twenty-one".