42155122123 has 2 divisors, whose sum is σ = 42155122124. Its totient is φ = 42155122122.

The previous prime is 42155122081. The next prime is 42155122133. The reversal of 42155122123 is 32122155124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42155122123 - 2²⁹ = 41618251211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42155122091 and 42155122100.

It is not a weakly prime, because it can be changed into another prime (42155122133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21077561061 + 21077561062.

It is an arithmetic number, because the mean of its divisors is an integer number (21077561062).

Almost surely, 2^42155122123 is an apocalyptic number.

42155122123 is a deficient number, since it is larger than the sum of its proper divisors (1).

42155122123 is an equidigital number, since it uses as much as digits as its factorization.

42155122123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 28.

Adding to 42155122123 its reverse (32122155124), we get a palindrome (74277277247).

The spelling of 42155122123 in words is "forty-two billion, one hundred fifty-five million, one hundred twenty-two thousand, one hundred twenty-three".