124207021 has 2 divisors, whose sum is σ = 124207022. Its totient is φ = 124207020.

The previous prime is 124207019. The next prime is 124207033. The reversal of 124207021 is 120702421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112572100 + 11634921 = 10610^2 + 3411^2 .

It is a cyclic number.

It is not a de Polignac number, because 124207021 - 2¹ = 124207019 is a prime.

Together with 124207019, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 124207021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124204021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62103510 + 62103511.

It is an arithmetic number, because the mean of its divisors is an integer number (62103511).

Almost surely, 2^124207021 is an apocalyptic number.

It is an amenable number.

124207021 is a deficient number, since it is larger than the sum of its proper divisors (1).

124207021 is an equidigital number, since it uses as much as digits as its factorization.

124207021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 124207021 is about 11144.8203664303. The cubic root of 124207021 is about 498.9404509643.

Adding to 124207021 its reverse (120702421), we get a palindrome (244909442).

The spelling of 124207021 in words is "one hundred twenty-four million, two hundred seven thousand, twenty-one".