21231134344 has 96 divisors (see below), whose sum is σ = 47007216000. Its totient is φ = 8962192512.

The previous prime is 21231134329. The next prime is 21231134357. The reversal of 21231134344 is 44343113212.

It is a happy number.

It is a super-2 number, since 2×21231134344² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25610122 + ... + 25610950.

It is an arithmetic number, because the mean of its divisors is an integer number (489658500).

Almost surely, 2^21231134344 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 21231134344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23503608000).

21231134344 is an abundant number, since it is smaller than the sum of its proper divisors (25776081656).

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

21231134344 is a wasteful number, since it uses less digits than its factorization.

21231134344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755 (or 1744 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

Adding to 21231134344 its reverse (44343113212), we get a palindrome (65574247556).

The spelling of 21231134344 in words is "twenty-one billion, two hundred thirty-one million, one hundred thirty-four thousand, three hundred forty-four".