42106123 has 4 divisors (see below), whose sum is σ = 43936848. Its totient is φ = 40275400.

The previous prime is 42106087. The next prime is 42106133. The reversal of 42106123 is 32160124.

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 42106123 - 2⁹ = 42105611 is a prime.

It is a super-2 number, since 2×42106123² = 3545851188182258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42106123.

It is not an unprimeable number, because it can be changed into a prime (42106133) 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, 915328 + ... + 915373.

It is an arithmetic number, because the mean of its divisors is an integer number (10984212).

Almost surely, 2^42106123 is an apocalyptic number.

42106123 is a deficient number, since it is larger than the sum of its proper divisors (1830725).

42106123 is a wasteful number, since it uses less digits than its factorization.

42106123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830724.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 42106123 is about 6488.9231001762. The cubic root of 42106123 is about 347.8951852172.

Adding to 42106123 its reverse (32160124), we get a palindrome (74266247).

The spelling of 42106123 in words is "forty-two million, one hundred six thousand, one hundred twenty-three".