424004442221 has 2 divisors, whose sum is σ = 424004442222. Its totient is φ = 424004442220.

The previous prime is 424004442139. The next prime is 424004442229. The reversal of 424004442221 is 122244400424.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279429589321 + 144574852900 = 528611^2 + 380230^2 .

It is a cyclic number.

It is not a de Polignac number, because 424004442221 - 2²² = 424000247917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424004442229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212002221110 + 212002221111.

It is an arithmetic number, because the mean of its divisors is an integer number (212002221111).

Almost surely, 2^424004442221 is an apocalyptic number.

It is an amenable number.

424004442221 is a deficient number, since it is larger than the sum of its proper divisors (1).

424004442221 is an equidigital number, since it uses as much as digits as its factorization.

424004442221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16384, while the sum is 29.

Adding to 424004442221 its reverse (122244400424), we get a palindrome (546248842645).

The spelling of 424004442221 in words is "four hundred twenty-four billion, four million, four hundred forty-two thousand, two hundred twenty-one".