231211424 has 48 divisors (see below), whose sum is σ = 492283008. Its totient is φ = 106478592.

The previous prime is 231211363. The next prime is 231211427. The reversal of 231211424 is 424112132.

It is a junction number, because it is equal to n+sod(n) for n = 231211396 and 231211405.

It is not an unprimeable number, because it can be changed into a prime (231211427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21047 + ... + 30089.

It is an arithmetic number, because the mean of its divisors is an integer number (10255896).

Almost surely, 2^231211424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231211424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246141504).

231211424 is an abundant number, since it is smaller than the sum of its proper divisors (261071584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231211424 is a wasteful number, since it uses less digits than its factorization.

231211424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9117 (or 9109 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 231211424 is about 15205.6379017784. The cubic root of 231211424 is about 613.7663807929.

Adding to 231211424 its reverse (424112132), we get a palindrome (655323556).

The spelling of 231211424 in words is "two hundred thirty-one million, two hundred eleven thousand, four hundred twenty-four".