42131042123 has 4 divisors (see below), whose sum is σ = 42133907640. Its totient is φ = 42128176608.

The previous prime is 42131042087. The next prime is 42131042137. The reversal of 42131042123 is 32124013124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42131042123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42131042423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1410590 + ... + 1440147.

It is an arithmetic number, because the mean of its divisors is an integer number (10533476910).

Almost surely, 2^42131042123 is an apocalyptic number.

42131042123 is a deficient number, since it is larger than the sum of its proper divisors (2865517).

42131042123 is a wasteful number, since it uses less digits than its factorization.

42131042123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2865516.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 42131042123 its reverse (32124013124), we get a palindrome (74255055247).

The spelling of 42131042123 in words is "forty-two billion, one hundred thirty-one million, forty-two thousand, one hundred twenty-three".