42012123 has 4 divisors (see below), whose sum is σ = 56016168. Its totient is φ = 28008080.

The previous prime is 42012119. The next prime is 42012127. The reversal of 42012123 is 32121024.

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

It is an interprime number because it is at equal distance from previous prime (42012119) and next prime (42012127).

It is a cyclic number.

It is not a de Polignac number, because 42012123 - 2² = 42012119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42012127) 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, 7002018 + ... + 7002023.

It is an arithmetic number, because the mean of its divisors is an integer number (14004042).

Almost surely, 2^42012123 is an apocalyptic number.

42012123 is a deficient number, since it is larger than the sum of its proper divisors (14004045).

42012123 is a wasteful number, since it uses less digits than its factorization.

42012123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14004044.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 42012123 is about 6481.6759406808. The cubic root of 42012123 is about 347.6361056134.

Adding to 42012123 its reverse (32121024), we get a palindrome (74133147).

The spelling of 42012123 in words is "forty-two million, twelve thousand, one hundred twenty-three".