231191021880 has 1536 divisors, whose sum is σ = 1061786880000. Its totient is φ = 44144787456.

The previous prime is 231191021837. The next prime is 231191021947. The reversal of 231191021880 is 88120191132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 383 ways as a sum of consecutive naturals, for example, 300638136 + ... + 300638904.

It is an arithmetic number, because the mean of its divisors is an integer number (691267500).

Almost surely, 2^231191021880 is an apocalyptic number.

231191021880 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 231191021880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (530893440000).

231191021880 is an abundant number, since it is smaller than the sum of its proper divisors (830595858120).

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

231191021880 is a wasteful number, since it uses less digits than its factorization.

231191021880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858 (or 841 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The spelling of 231191021880 in words is "two hundred thirty-one billion, one hundred ninety-one million, twenty-one thousand, eight hundred eighty".