42135231 has 32 divisors (see below), whose sum is σ = 63590400. Its totient is φ = 24675840.

The previous prime is 42135211. The next prime is 42135239. The reversal of 42135231 is 13253124.

It is not a de Polignac number, because 42135231 - 2¹⁰ = 42134207 is a prime.

It is a super-2 number, since 2×42135231² = 3550755382846722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42135198 and 42135207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42135239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45390 + ... + 46308.

It is an arithmetic number, because the mean of its divisors is an integer number (1987200).

Almost surely, 2^42135231 is an apocalyptic number.

42135231 is a deficient number, since it is larger than the sum of its proper divisors (21455169).

42135231 is a wasteful number, since it uses less digits than its factorization.

42135231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999.

The product of its digits is 720, while the sum is 21.

The square root of 42135231 is about 6491.1656118143. The cubic root of 42135231 is about 347.9753335007.

Adding to 42135231 its reverse (13253124), we get a palindrome (55388355).

The spelling of 42135231 in words is "forty-two million, one hundred thirty-five thousand, two hundred thirty-one".