231021020 has 24 divisors (see below), whose sum is σ = 490149744. Its totient is φ = 91454976.

The previous prime is 231020963. The next prime is 231021023. The reversal of 231021020 is 20120132.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 231020992 and 231021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231021023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57602 + ... + 61481.

It is an arithmetic number, because the mean of its divisors is an integer number (20422906).

Almost surely, 2^231021020 is an apocalyptic number.

231021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231021020 is an abundant number, since it is smaller than the sum of its proper divisors (259128724).

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

231021020 is a wasteful number, since it uses less digits than its factorization.

231021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119189 (or 119187 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 231021020 is about 15199.3756450717. The cubic root of 231021020 is about 613.5978544201.

Adding to 231021020 its reverse (20120132), we get a palindrome (251141152).

The spelling of 231021020 in words is "two hundred thirty-one million, twenty-one thousand, twenty".