42120231 has 8 divisors (see below), whose sum is σ = 56199024. Its totient is φ = 28060800.

The previous prime is 42120217. The next prime is 42120233. The reversal of 42120231 is 13202124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42120231 - 2⁶ = 42120167 is a prime.

It is a super-2 number, since 2×42120231² = 3548227718986722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42120231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42120233) 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 7 ways as a sum of consecutive naturals, for example, 1381 + ... + 9281.

It is an arithmetic number, because the mean of its divisors is an integer number (7024878).

Almost surely, 2^42120231 is an apocalyptic number.

42120231 is a deficient number, since it is larger than the sum of its proper divisors (14078793).

42120231 is a wasteful number, since it uses less digits than its factorization.

42120231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9681.

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

The square root of 42120231 is about 6490.0100924421. The cubic root of 42120231 is about 347.9340359184.

Adding to 42120231 its reverse (13202124), we get a palindrome (55322355).

The spelling of 42120231 in words is "forty-two million, one hundred twenty thousand, two hundred thirty-one".