42003120409 has 2 divisors, whose sum is σ = 42003120410. Its totient is φ = 42003120408.

The previous prime is 42003120407. The next prime is 42003120433. The reversal of 42003120409 is 90402130024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38101868809 + 3901251600 = 195197^2 + 62460^2 .

It is a cyclic number.

It is not a de Polignac number, because 42003120409 - 2¹ = 42003120407 is a prime.

Together with 42003120407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42003120407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21001560204 + 21001560205.

It is an arithmetic number, because the mean of its divisors is an integer number (21001560205).

Almost surely, 2^42003120409 is an apocalyptic number.

It is an amenable number.

42003120409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42003120409 is an equidigital number, since it uses as much as digits as its factorization.

42003120409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 42003120409 in words is "forty-two billion, three million, one hundred twenty thousand, four hundred nine".