12003721 has 2 divisors, whose sum is σ = 12003722. Its totient is φ = 12003720.

The previous prime is 12003703. The next prime is 12003731. The reversal of 12003721 is 12730021.

It is a happy number.

12003721 is digitally balanced in base 2 and base 3, because in such bases 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., 11485321 + 518400 = 3389^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 12003721 - 2⁵ = 12003689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12003695 and 12003704.

It is not a weakly prime, because it can be changed into another prime (12003701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6001860 + 6001861.

It is an arithmetic number, because the mean of its divisors is an integer number (6001861).

Almost surely, 2^12003721 is an apocalyptic number.

It is an amenable number.

12003721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12003721 is an equidigital number, since it uses as much as digits as its factorization.

12003721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 12003721 is about 3464.6386535972. The cubic root of 12003721 is about 228.9665098524.

Adding to 12003721 its reverse (12730021), we get a palindrome (24733742).

The spelling of 12003721 in words is "twelve million, three thousand, seven hundred twenty-one".