231285668721 has 16 divisors (see below), whose sum is σ = 311277669120. Its totient is φ = 152742672000.

The previous prime is 231285668639. The next prime is 231285668749. The reversal of 231285668721 is 127866582132.

It is not a de Polignac number, because 231285668721 - 2⁹ = 231285668209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231285668771) 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 15 ways as a sum of consecutive naturals, for example, 1479141 + ... + 1628013.

It is an arithmetic number, because the mean of its divisors is an integer number (19454854320).

Almost surely, 2^231285668721 is an apocalyptic number.

It is an amenable number.

231285668721 is a deficient number, since it is larger than the sum of its proper divisors (79992000399).

231285668721 is a wasteful number, since it uses less digits than its factorization.

231285668721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153736.

The product of its digits is 1935360, while the sum is 51.

The spelling of 231285668721 in words is "two hundred thirty-one billion, two hundred eighty-five million, six hundred sixty-eight thousand, seven hundred twenty-one".