42420142409 has 2 divisors, whose sum is σ = 42420142410. Its totient is φ = 42420142408.

The previous prime is 42420142367. The next prime is 42420142433. The reversal of 42420142409 is 90424102424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42406341184 + 13801225 = 205928^2 + 3715^2 .

It is a cyclic number.

It is not a de Polignac number, because 42420142409 - 2⁸ = 42420142153 is a prime.

It is not a weakly prime, because it can be changed into another prime (42420142909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21210071204 + 21210071205.

It is an arithmetic number, because the mean of its divisors is an integer number (21210071205).

Almost surely, 2^42420142409 is an apocalyptic number.

It is an amenable number.

42420142409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42420142409 is an equidigital number, since it uses as much as digits as its factorization.

42420142409 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 32.

The spelling of 42420142409 in words is "forty-two billion, four hundred twenty million, one hundred forty-two thousand, four hundred nine".