21313231232232 has 128 divisors (see below), whose sum is σ = 56168852803200. Its totient is φ = 6728998628352.

The previous prime is 21313231232219. The next prime is 21313231232273. The reversal of 21313231232232 is 23223213231312.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21313231232232.

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, 268615638 + ... + 268694970.

It is an arithmetic number, because the mean of its divisors is an integer number (438819162525).

Almost surely, 2^{21313231232232} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21313231232232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28084426401600).

21313231232232 is an abundant number, since it is smaller than the sum of its proper divisors (34855621570968).

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

21313231232232 is a wasteful number, since it uses less digits than its factorization.

21313231232232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86707 (or 86703 counting only the distinct ones).

The product of its digits is 15552, while the sum is 30.

Adding to 21313231232232 its reverse (23223213231312), we get a palindrome (44536444463544).

The spelling of 21313231232232 in words is "twenty-one trillion, three hundred thirteen billion, two hundred thirty-one million, two hundred thirty-two thousand, two hundred thirty-two".