42143424209 has 2 divisors, whose sum is σ = 42143424210. Its totient is φ = 42143424208.

The previous prime is 42143424187. The next prime is 42143424307. The reversal of 42143424209 is 90242434124.

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., 41795713600 + 347710609 = 204440^2 + 18647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42143424209 is a prime.

It is not a weakly prime, because it can be changed into another prime (42143424709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21071712104 + 21071712105.

It is an arithmetic number, because the mean of its divisors is an integer number (21071712105).

Almost surely, 2^42143424209 is an apocalyptic number.

It is an amenable number.

42143424209 is a deficient number, since it is larger than the sum of its proper divisors (1).

42143424209 is an equidigital number, since it uses as much as digits as its factorization.

42143424209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 35.

The spelling of 42143424209 in words is "forty-two billion, one hundred forty-three million, four hundred twenty-four thousand, two hundred nine".