231131223021000 has 128 divisors (see below), whose sum is σ = 721212893256960. Its totient is φ = 61627857984000.

The previous prime is 231131223020953. The next prime is 231131223021011. The reversal of 231131223021000 is 120322131132.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21486060 + ... + 30395940.

It is an arithmetic number, because the mean of its divisors is an integer number (5634475728570).

Almost surely, 2^{231131223021000} is an apocalyptic number.

231131223021000 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 231131223021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360606446628480).

231131223021000 is an abundant number, since it is smaller than the sum of its proper divisors (490081670235960).

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

231131223021000 is a wasteful number, since it uses less digits than its factorization.

231131223021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8918552 (or 8918538 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 231131223021000 its reverse (120322131132), we get a palindrome (231251545152132).

The spelling of 231131223021000 in words is "two hundred thirty-one trillion, one hundred thirty-one billion, two hundred twenty-three million, twenty-one thousand".