231321202020 has 144 divisors (see below), whose sum is σ = 709298623488. Its totient is φ = 61016094720.

The previous prime is 231321202009. The next prime is 231321202069. The reversal of 231321202020 is 20202123132.

231321202020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231321201984 and 231321202002.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59204907 + ... + 59208813.

Almost surely, 2^231321202020 is an apocalyptic number.

231321202020 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 231321202020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354649311744).

231321202020 is an abundant number, since it is smaller than the sum of its proper divisors (477977421468).

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

231321202020 is a wasteful number, since it uses less digits than its factorization.

231321202020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7410 (or 7405 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 231321202020 its reverse (20202123132), we get a palindrome (251523325152).

The spelling of 231321202020 in words is "two hundred thirty-one billion, three hundred twenty-one million, two hundred two thousand, twenty".