42231213 has 24 divisors (see below), whose sum is σ = 66987648. Its totient is φ = 26495424.

The previous prime is 42231191. The next prime is 42231223. The reversal of 42231213 is 31213224.

42231213 is a `hidden beast` number, since 422 + 31 + 213 = 666.

It is not a de Polignac number, because 42231213 - 2⁹ = 42230701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42231223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 981 + ... + 9242.

It is an arithmetic number, because the mean of its divisors is an integer number (2791152).

Almost surely, 2^42231213 is an apocalyptic number.

It is an amenable number.

42231213 is a deficient number, since it is larger than the sum of its proper divisors (24756435).

42231213 is a wasteful number, since it uses less digits than its factorization.

42231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10255 (or 10243 counting only the distinct ones).

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

The square root of 42231213 is about 6498.5546854666. The cubic root of 42231213 is about 348.2393567342.

Adding to 42231213 its reverse (31213224), we get a palindrome (73444437).

The spelling of 42231213 in words is "forty-two million, two hundred thirty-one thousand, two hundred thirteen".