231321402320 has 320 divisors, whose sum is σ = 590105088000. Its totient is φ = 84115046400.

The previous prime is 231321402259. The next prime is 231321402353. The reversal of 231321402320 is 23204123132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 454462226 + ... + 454462734.

It is an arithmetic number, because the mean of its divisors is an integer number (1844078400).

Almost surely, 2^231321402320 is an apocalyptic number.

231321402320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231321402320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295052544000).

231321402320 is an abundant number, since it is smaller than the sum of its proper divisors (358783685680).

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

231321402320 is a wasteful number, since it uses less digits than its factorization.

231321402320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 231321402320 its reverse (23204123132), we get a palindrome (254525525452).

The spelling of 231321402320 in words is "two hundred thirty-one billion, three hundred twenty-one million, four hundred two thousand, three hundred twenty".