424241021 has 2 divisors, whose sum is σ = 424241022. Its totient is φ = 424241020.

The previous prime is 424240997. The next prime is 424241023. The reversal of 424241021 is 120142424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 277588921 + 146652100 = 16661^2 + 12110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-424241021 is a prime.

Together with 424241023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 424240984 and 424241002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424241023) 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, 212120510 + 212120511.

It is an arithmetic number, because the mean of its divisors is an integer number (212120511).

Almost surely, 2^424241021 is an apocalyptic number.

It is an amenable number.

424241021 is a deficient number, since it is larger than the sum of its proper divisors (1).

424241021 is an equidigital number, since it uses as much as digits as its factorization.

424241021 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 424241021 is about 20597.1119577479. Note that the first 3 decimals coincide. The cubic root of 424241021 is about 751.3994735261.

Adding to 424241021 its reverse (120142424), we get a palindrome (544383445).

The spelling of 424241021 in words is "four hundred twenty-four million, two hundred forty-one thousand, twenty-one".