21311444232 has 96 divisors (see below), whose sum is σ = 62739593280. Its totient is φ = 6496053120.

The previous prime is 21311444197. The next prime is 21311444249. The reversal of 21311444232 is 23244411312.

21311444232 is a `hidden beast` number, since 213 + 1 + 1 + 4 + 442 + 3 + 2 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21311444196 and 21311444205.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6244 + ... + 206547.

It is an arithmetic number, because the mean of its divisors is an integer number (653537430).

Almost surely, 2^21311444232 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 21311444232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31369796640).

21311444232 is an abundant number, since it is smaller than the sum of its proper divisors (41428149048).

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

21311444232 is a wasteful number, since it uses less digits than its factorization.

21311444232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212923 (or 212916 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21311444232 its reverse (23244411312), we get a palindrome (44555855544).

The spelling of 21311444232 in words is "twenty-one billion, three hundred eleven million, four hundred forty-four thousand, two hundred thirty-two".