42663221 has 2 divisors, whose sum is σ = 42663222. Its totient is φ = 42663220.

The previous prime is 42663211. The next prime is 42663253. The reversal of 42663221 is 12236624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30096196 + 12567025 = 5486^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 42663221 - 2⁶ = 42663157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42663211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21331610 + 21331611.

It is an arithmetic number, because the mean of its divisors is an integer number (21331611).

Almost surely, 2^42663221 is an apocalyptic number.

It is an amenable number.

42663221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42663221 is an equidigital number, since it uses as much as digits as its factorization.

42663221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

The square root of 42663221 is about 6531.7088881854. The cubic root of 42663221 is about 349.4227791816.

Adding to 42663221 its reverse (12236624), we get a palindrome (54899845).

The spelling of 42663221 in words is "forty-two million, six hundred sixty-three thousand, two hundred twenty-one".