231221232000 has 768 divisors, whose sum is σ = 921096671040. Its totient is φ = 55111680000.

The previous prime is 231221231993. The next prime is 231221232017. The reversal of 231221232000 is 232122132.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 96622804 + ... + 96625196.

Almost surely, 2^231221232000 is an apocalyptic number.

231221232000 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 231221232000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460548335520).

231221232000 is an abundant number, since it is smaller than the sum of its proper divisors (689875439040).

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

231221232000 is a wasteful number, since it uses less digits than its factorization.

231221232000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500 (or 2475 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 231221232000 its reverse (232122132), we get a palindrome (231453354132).

The spelling of 231221232000 in words is "two hundred thirty-one billion, two hundred twenty-one million, two hundred thirty-two thousand".