126360721 has 2 divisors, whose sum is σ = 126360722. Its totient is φ = 126360720.

The previous prime is 126360719. The next prime is 126360749. The reversal of 126360721 is 127063621.

It is an a-pointer prime, because the next prime (126360749) can be obtained adding 126360721 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67240000 + 59120721 = 8200^2 + 7689^2 .

It is a cyclic number.

It is not a de Polignac number, because 126360721 - 2¹ = 126360719 is a prime.

Together with 126360719, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 126360721.

It is not a weakly prime, because it can be changed into another prime (126360701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63180360 + 63180361.

It is an arithmetic number, because the mean of its divisors is an integer number (63180361).

Almost surely, 2^126360721 is an apocalyptic number.

It is an amenable number.

126360721 is a deficient number, since it is larger than the sum of its proper divisors (1).

126360721 is an equidigital number, since it uses as much as digits as its factorization.

126360721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 126360721 is about 11241.0284671822. The cubic root of 126360721 is about 501.8077508634.

The spelling of 126360721 in words is "one hundred twenty-six million, three hundred sixty thousand, seven hundred twenty-one".