231821392856 has 16 divisors (see below), whose sum is σ = 437066579040. Its totient is φ = 115270305120.

The previous prime is 231821392853. The next prime is 231821392871. The reversal of 231821392856 is 658293128132.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231821392853) 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 3 ways as a sum of consecutive naturals, for example, 80047376 + ... + 80050271.

It is an arithmetic number, because the mean of its divisors is an integer number (27316661190).

Almost surely, 2^231821392856 is an apocalyptic number.

It is an amenable number.

231821392856 is a deficient number, since it is larger than the sum of its proper divisors (205245186184).

231821392856 is a wasteful number, since it uses less digits than its factorization.

231821392856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160097834 (or 160097830 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 50.

The spelling of 231821392856 in words is "two hundred thirty-one billion, eight hundred twenty-one million, three hundred ninety-two thousand, eight hundred fifty-six".