231021424 has 40 divisors (see below), whose sum is σ = 478005120. Its totient is φ = 107923200.

The previous prime is 231021419. The next prime is 231021431. The reversal of 231021424 is 424120132.

231021424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6354 + ... + 22414.

It is an arithmetic number, because the mean of its divisors is an integer number (11950128).

Almost surely, 2^231021424 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 231021424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239002560).

231021424 is an abundant number, since it is smaller than the sum of its proper divisors (246983696).

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

231021424 is a wasteful number, since it uses less digits than its factorization.

231021424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16129 (or 16123 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 231021424 is about 15199.3889350855. The cubic root of 231021424 is about 613.5982120980.

Adding to 231021424 its reverse (424120132), we get a palindrome (655141556).

The spelling of 231021424 in words is "two hundred thirty-one million, twenty-one thousand, four hundred twenty-four".