231221140440000 has 280 divisors, whose sum is σ = 764528190666240. Its totient is φ = 61654361472000.

The previous prime is 231221140439951. The next prime is 231221140440023. The reversal of 231221140440000 is 44041122132.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1790695441 + ... + 1790824559.

It is an arithmetic number, because the mean of its divisors is an integer number (2730457823808).

Almost surely, 2^{231221140440000} is an apocalyptic number.

231221140440000 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 231221140440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (382264095333120).

231221140440000 is an abundant number, since it is smaller than the sum of its proper divisors (533307050226240).

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

231221140440000 is a wasteful number, since it uses less digits than its factorization.

231221140440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144077 (or 144052 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 231221140440000 its reverse (44041122132), we get a palindrome (231265181562132).

The spelling of 231221140440000 in words is "two hundred thirty-one trillion, two hundred twenty-one billion, one hundred forty million, four hundred forty thousand".