42105532009 has 2 divisors, whose sum is σ = 42105532010. Its totient is φ = 42105532008.

The previous prime is 42105531997. The next prime is 42105532043. The reversal of 42105532009 is 90023550124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40158957609 + 1946574400 = 200397^2 + 44120^2 .

It is a cyclic number.

It is not a de Polignac number, because 42105532009 - 2¹⁷ = 42105400937 is a prime.

It is not a weakly prime, because it can be changed into another prime (42105532109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21052766004 + 21052766005.

It is an arithmetic number, because the mean of its divisors is an integer number (21052766005).

Almost surely, 2^42105532009 is an apocalyptic number.

It is an amenable number.

42105532009 is a deficient number, since it is larger than the sum of its proper divisors (1).

42105532009 is an equidigital number, since it uses as much as digits as its factorization.

42105532009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 42105532009 in words is "forty-two billion, one hundred five million, five hundred thirty-two thousand, nine".