42210423209 has 2 divisors, whose sum is σ = 42210423210. Its totient is φ = 42210423208.

The previous prime is 42210423181. The next prime is 42210423247. The reversal of 42210423209 is 90232401224.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41373594025 + 836829184 = 203405^2 + 28928^2 .

It is a cyclic number.

It is not a de Polignac number, because 42210423209 - 2⁸ = 42210422953 is a prime.

It is not a weakly prime, because it can be changed into another prime (42210423109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21105211604 + 21105211605.

It is an arithmetic number, because the mean of its divisors is an integer number (21105211605).

Almost surely, 2^42210423209 is an apocalyptic number.

It is an amenable number.

42210423209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42210423209 is an equidigital number, since it uses as much as digits as its factorization.

42210423209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 42210423209 in words is "forty-two billion, two hundred ten million, four hundred twenty-three thousand, two hundred nine".