231021020320 has 96 divisors (see below), whose sum is σ = 579867498000. Its totient is φ = 86810443776.

The previous prime is 231021020297. The next prime is 231021020339. The reversal of 231021020320 is 23020120132.

It can be written as a sum of positive squares in 8 ways, for example, as 219020256016 + 12000764304 = 467996^2 + 109548^2 .

It is a super-3 number, since 3×231021020320³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 231021020294 and 231021020303.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501145 + ... + 844504.

Almost surely, 2^231021020320 is an apocalyptic number.

231021020320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231021020320 is an abundant number, since it is smaller than the sum of its proper divisors (348846477680).

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

231021020320 is a wasteful number, since it uses less digits than its factorization.

231021020320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345730 (or 1345722 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 231021020320 its reverse (23020120132), we get a palindrome (254041140452).

The spelling of 231021020320 in words is "two hundred thirty-one billion, twenty-one million, twenty thousand, three hundred twenty".