424124021 has 2 divisors, whose sum is σ = 424124022. Its totient is φ = 424124020.

The previous prime is 424124017. The next prime is 424124089. The reversal of 424124021 is 120421424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401561521 + 22562500 = 20039^2 + 4750^2 .

It is a cyclic number.

It is not a de Polignac number, because 424124021 - 2² = 424124017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 424123984 and 424124002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424124221) 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, 212062010 + 212062011.

It is an arithmetic number, because the mean of its divisors is an integer number (212062011).

Almost surely, 2^424124021 is an apocalyptic number.

It is an amenable number.

424124021 is a deficient number, since it is larger than the sum of its proper divisors (1).

424124021 is an equidigital number, since it uses as much as digits as its factorization.

424124021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 424124021 is about 20594.2715578872. The cubic root of 424124021 is about 751.3303918664.

Adding to 424124021 its reverse (120421424), we get a palindrome (544545445).

The spelling of 424124021 in words is "four hundred twenty-four million, one hundred twenty-four thousand, twenty-one".