42217123 has 4 divisors (see below), whose sum is σ = 45464608. Its totient is φ = 38969640.

The previous prime is 42217081. The next prime is 42217157. The reversal of 42217123 is 32171224.

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 42217123 - 2¹³ = 42208931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42217094 and 42217103.

It is not an unprimeable number, because it can be changed into a prime (42217223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1623723 + ... + 1623748.

It is an arithmetic number, because the mean of its divisors is an integer number (11366152).

Almost surely, 2^42217123 is an apocalyptic number.

42217123 is a deficient number, since it is larger than the sum of its proper divisors (3247485).

42217123 is a wasteful number, since it uses less digits than its factorization.

42217123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247484.

The product of its digits is 672, while the sum is 22.

The square root of 42217123 is about 6497.4705078207. The cubic root of 42217123 is about 348.2006236268.

Adding to 42217123 its reverse (32171224), we get a palindrome (74388347).

The spelling of 42217123 in words is "forty-two million, two hundred seventeen thousand, one hundred twenty-three".