42123318137819 has 2 divisors, whose sum is σ = 42123318137820. Its totient is φ = 42123318137818.

The previous prime is 42123318137773. The next prime is 42123318137833. The reversal of 42123318137819 is 91873181332124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42123318137819 - 2¹² = 42123318133723 is a prime.

It is a super-3 number, since 3×42123318137819³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (42123318137839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21061659068909 + 21061659068910.

It is an arithmetic number, because the mean of its divisors is an integer number (21061659068910).

Almost surely, 2^{42123318137819} is an apocalyptic number.

42123318137819 is a deficient number, since it is larger than the sum of its proper divisors (1).

42123318137819 is an equidigital number, since it uses as much as digits as its factorization.

42123318137819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The spelling of 42123318137819 in words is "forty-two trillion, one hundred twenty-three billion, three hundred eighteen million, one hundred thirty-seven thousand, eight hundred nineteen".