231211523500000 has 168 divisors, whose sum is σ = 569133878274360. Its totient is φ = 92461195200000.

The previous prime is 231211523499967. The next prime is 231211523500003. The reversal of 231211523500000 is 5325112132.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231211523500003) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2046443511 + ... + 2046556489.

It is an arithmetic number, because the mean of its divisors is an integer number (3387701656395).

Almost surely, 2^{231211523500000} is an apocalyptic number.

231211523500000 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 231211523500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284566939137180).

231211523500000 is an abundant number, since it is smaller than the sum of its proper divisors (337922354774360).

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

231211523500000 is an frugal number, since it uses more digits than its factorization.

231211523500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117112 (or 117079 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 231211523500000 its reverse (5325112132), we get a palindrome (231216848612132).

The spelling of 231211523500000 in words is "two hundred thirty-one trillion, two hundred eleven billion, five hundred twenty-three million, five hundred thousand".