42123231 has 12 divisors (see below), whose sum is σ = 60908640. Its totient is φ = 28052640.

The previous prime is 42123217. The next prime is 42123239. The reversal of 42123231 is 13232124.

It is not a de Polignac number, because 42123231 - 2⁵ = 42123199 is a prime.

It is a super-2 number, since 2×42123231² = 3548733179758722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42123239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9786 + ... + 13416.

It is an arithmetic number, because the mean of its divisors is an integer number (5075720).

Almost surely, 2^42123231 is an apocalyptic number.

42123231 is a deficient number, since it is larger than the sum of its proper divisors (18785409).

42123231 is a wasteful number, since it uses less digits than its factorization.

42123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4926 (or 4923 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 42123231 is about 6490.2412127748. The cubic root of 42123231 is about 347.9422962191.

Adding to 42123231 its reverse (13232124), we get a palindrome (55355355).

The spelling of 42123231 in words is "forty-two million, one hundred twenty-three thousand, two hundred thirty-one".