42210123 has 4 divisors (see below), whose sum is σ = 56280168. Its totient is φ = 28140080.

The previous prime is 42210071. The next prime is 42210137. The reversal of 42210123 is 32101224.

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

It is a cyclic number.

It is not a de Polignac number, because 42210123 - 2⁶ = 42210059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42210163) 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, 7035018 + ... + 7035023.

It is an arithmetic number, because the mean of its divisors is an integer number (14070042).

Almost surely, 2^42210123 is an apocalyptic number.

42210123 is a deficient number, since it is larger than the sum of its proper divisors (14070045).

42210123 is a wasteful number, since it uses less digits than its factorization.

42210123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14070044.

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

The square root of 42210123 is about 6496.9318143259. The cubic root of 42210123 is about 348.1813775727.

Adding to 42210123 its reverse (32101224), we get a palindrome (74311347).

The spelling of 42210123 in words is "forty-two million, two hundred ten thousand, one hundred twenty-three".