124000021 has 2 divisors, whose sum is σ = 124000022. Its totient is φ = 124000020.

The previous prime is 124000001. The next prime is 124000039. The reversal of 124000021 is 120000421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108680625 + 15319396 = 10425^2 + 3914^2 .

It is a cyclic number.

It is not a de Polignac number, because 124000021 - 2¹⁹ = 123475733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123999971 and 124000007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62000010 + 62000011.

It is an arithmetic number, because the mean of its divisors is an integer number (62000011).

Almost surely, 2^124000021 is an apocalyptic number.

It is an amenable number.

124000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

124000021 is an equidigital number, since it uses as much as digits as its factorization.

124000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 124000021 is about 11135.5296685878. The cubic root of 124000021 is about 498.6631233742.

Adding to 124000021 its reverse (120000421), we get a palindrome (244000442).

The spelling of 124000021 in words is "one hundred twenty-four million, twenty-one", and thus it is an aban number.