42434304221 has 2 divisors, whose sum is σ = 42434304222. Its totient is φ = 42434304220.

The previous prime is 42434304217. The next prime is 42434304233. The reversal of 42434304221 is 12240343424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35490415321 + 6943888900 = 188389^2 + 83330^2 .

It is a cyclic number.

It is not a de Polignac number, because 42434304221 - 2² = 42434304217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42434324221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21217152110 + 21217152111.

It is an arithmetic number, because the mean of its divisors is an integer number (21217152111).

Almost surely, 2^42434304221 is an apocalyptic number.

It is an amenable number.

42434304221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42434304221 is an equidigital number, since it uses as much as digits as its factorization.

42434304221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 42434304221 its reverse (12240343424), we get a palindrome (54674647645).

The spelling of 42434304221 in words is "forty-two billion, four hundred thirty-four million, three hundred four thousand, two hundred twenty-one".