124743420721 has 2 divisors, whose sum is σ = 124743420722. Its totient is φ = 124743420720.

The previous prime is 124743420689. The next prime is 124743420727. The reversal of 124743420721 is 127024347421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124683141025 + 60279696 = 353105^2 + 7764^2 .

It is a cyclic number.

It is not a de Polignac number, because 124743420721 - 2⁵ = 124743420689 is a prime.

It is not a weakly prime, because it can be changed into another prime (124743420727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62371710360 + 62371710361.

It is an arithmetic number, because the mean of its divisors is an integer number (62371710361).

Almost surely, 2^124743420721 is an apocalyptic number.

It is an amenable number.

124743420721 is a deficient number, since it is larger than the sum of its proper divisors (1).

124743420721 is an equidigital number, since it uses as much as digits as its factorization.

124743420721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 37.

The spelling of 124743420721 in words is "one hundred twenty-four billion, seven hundred forty-three million, four hundred twenty thousand, seven hundred twenty-one".