42420142909 has 2 divisors, whose sum is σ = 42420142910. Its totient is φ = 42420142908.

The previous prime is 42420142859. The next prime is 42420142927. The reversal of 42420142909 is 90924102424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40190225625 + 2229917284 = 200475^2 + 47222^2 .

It is a cyclic number.

It is not a de Polignac number, because 42420142909 - 2¹⁹ = 42419618621 is a prime.

It is a super-3 number, since 3×42420142909³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42420142969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21210071454 + 21210071455.

It is an arithmetic number, because the mean of its divisors is an integer number (21210071455).

Almost surely, 2^42420142909 is an apocalyptic number.

It is an amenable number.

42420142909 is a deficient number, since it is larger than the sum of its proper divisors (1).

42420142909 is an equidigital number, since it uses as much as digits as its factorization.

42420142909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 42420142909 in words is "forty-two billion, four hundred twenty million, one hundred forty-two thousand, nine hundred nine".