42531321 has 16 divisors (see below), whose sum is σ = 65059200. Its totient is φ = 24210048.

The previous prime is 42531319. The next prime is 42531337. The reversal of 42531321 is 12313524.

It is not a de Polignac number, because 42531321 - 2¹ = 42531319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (42531311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1885 + ... + 9413.

It is an arithmetic number, because the mean of its divisors is an integer number (4066200).

Almost surely, 2^42531321 is an apocalyptic number.

It is an amenable number.

42531321 is a deficient number, since it is larger than the sum of its proper divisors (22527879).

42531321 is a wasteful number, since it uses less digits than its factorization.

42531321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7808.

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

The square root of 42531321 is about 6521.6041738210. The cubic root of 42531321 is about 349.0623091076.

Adding to 42531321 its reverse (12313524), we get a palindrome (54844845).

The spelling of 42531321 in words is "forty-two million, five hundred thirty-one thousand, three hundred twenty-one".