43213231 has 4 divisors (see below), whose sum is σ = 43266312. Its totient is φ = 43160152.

The previous prime is 43213217. The next prime is 43213241. The reversal of 43213231 is 13231234.

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 43213231 - 2¹³ = 43205039 is a prime.

It is a super-2 number, since 2×43213231² = 3734766666918722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43213199 and 43213208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43213211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25300 + ... + 26953.

It is an arithmetic number, because the mean of its divisors is an integer number (10816578).

Almost surely, 2^43213231 is an apocalyptic number.

43213231 is a deficient number, since it is larger than the sum of its proper divisors (53081).

43213231 is an equidigital number, since it uses as much as digits as its factorization.

43213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53080.

The product of its digits is 432, while the sum is 19.

The square root of 43213231 is about 6573.6771292786. The cubic root of 43213231 is about 350.9179468538.

Adding to 43213231 its reverse (13231234), we get a palindrome (56444465).

The spelling of 43213231 in words is "forty-three million, two hundred thirteen thousand, two hundred thirty-one".