231020221020 has 48 divisors (see below), whose sum is σ = 646885104768. Its totient is φ = 61602679360.

The previous prime is 231020220989. The next prime is 231020221087. The reversal of 231020221020 is 20122020132.

It is a happy number.

231020221020 is digitally balanced in base 2, 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 (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1549387 + ... + 1691933.

It is an arithmetic number, because the mean of its divisors is an integer number (13476773016).

Almost surely, 2^231020221020 is an apocalyptic number.

231020221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231020221020 is an abundant number, since it is smaller than the sum of its proper divisors (415864883748).

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

231020221020 is a wasteful number, since it uses less digits than its factorization.

231020221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169570 (or 169568 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 231020221020 its reverse (20122020132), we get a palindrome (251142241152).

The spelling of 231020221020 in words is "two hundred thirty-one billion, twenty million, two hundred twenty-one thousand, twenty".