231563982321 has 24 divisors (see below), whose sum is σ = 382277750400. Its totient is φ = 132317637696.

The previous prime is 231563982289. The next prime is 231563982337. The reversal of 231563982321 is 123289365132.

231563982321 is a `hidden beast` number, since 2 + 3 + 1 + 5 + 639 + 8 + 2 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 231563982321 - 2⁵ = 231563982289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231563980321) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2643796 + ... + 2729978.

It is an arithmetic number, because the mean of its divisors is an integer number (15928239600).

Almost surely, 2^231563982321 is an apocalyptic number.

231563982321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231563982321 is a deficient number, since it is larger than the sum of its proper divisors (150713768079).

231563982321 is a wasteful number, since it uses less digits than its factorization.

231563982321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128845 (or 128842 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The spelling of 231563982321 in words is "two hundred thirty-one billion, five hundred sixty-three million, nine hundred eighty-two thousand, three hundred twenty-one".