12006721 has 2 divisors, whose sum is σ = 12006722. Its totient is φ = 12006720.

The previous prime is 12006679. The next prime is 12006733. The reversal of 12006721 is 12760021.

12006721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11937025 + 69696 = 3455^2 + 264^2 .

It is an emirp because it is prime and its reverse (12760021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12006721 - 2¹¹ = 12004673 is a prime.

It is a super-2 number, since 2×12006721² = 288322698343682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12006751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6003360 + 6003361.

It is an arithmetic number, because the mean of its divisors is an integer number (6003361).

Almost surely, 2^12006721 is an apocalyptic number.

It is an amenable number.

12006721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12006721 is an equidigital number, since it uses as much as digits as its factorization.

12006721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 12006721 is about 3465.0715721324. The cubic root of 12006721 is about 228.9855828913.

Adding to 12006721 its reverse (12760021), we get a palindrome (24766742).

It can be divided in two parts, 1200 and 6721, that added together give a square (7921 = 89²).

The spelling of 12006721 in words is "twelve million, six thousand, seven hundred twenty-one".