12267721 has 2 divisors, whose sum is σ = 12267722. Its totient is φ = 12267720.

The previous prime is 12267719. The next prime is 12267737. The reversal of 12267721 is 12776221.

12267721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11289600 + 978121 = 3360^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 12267721 - 2¹ = 12267719 is a prime.

Together with 12267719, it forms a pair of twin primes.

It is equal to p₈₀₄₄₃₉ and since 12267721 and 804439 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12267721.

It is not a weakly prime, because it can be changed into another prime (12267701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6133860 + 6133861.

It is an arithmetic number, because the mean of its divisors is an integer number (6133861).

Almost surely, 2^12267721 is an apocalyptic number.

It is an amenable number.

12267721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12267721 is an equidigital number, since it uses as much as digits as its factorization.

12267721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 28.

The square root of 12267721 is about 3502.5306565396. The cubic root of 12267721 is about 230.6329196048.

The spelling of 12267721 in words is "twelve million, two hundred sixty-seven thousand, seven hundred twenty-one".