42212231 has 4 divisors (see below), whose sum is σ = 42243600. Its totient is φ = 42180864.

The previous prime is 42212189. The next prime is 42212237. The reversal of 42212231 is 13221224.

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 42212231 - 2¹⁸ = 41950087 is a prime.

It is a super-2 number, since 2×42212231² = 3563744891994722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42212237) 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, 13571 + ... + 16388.

It is an arithmetic number, because the mean of its divisors is an integer number (10560900).

Almost surely, 2^42212231 is an apocalyptic number.

42212231 is a deficient number, since it is larger than the sum of its proper divisors (31369).

42212231 is a wasteful number, since it uses less digits than its factorization.

42212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31368.

The product of its digits is 192, while the sum is 17.

The square root of 42212231 is about 6497.0940427240. The cubic root of 42212231 is about 348.1871736083.

Adding to 42212231 its reverse (13221224), we get a palindrome (55433455).

It can be divided in two parts, 4221223 and 1, that added together give a palindrome (4221224).

The spelling of 42212231 in words is "forty-two million, two hundred twelve thousand, two hundred thirty-one".