21343444344 has 96 divisors (see below), whose sum is σ = 61406202000. Its totient is φ = 6678153216.

The previous prime is 21343444303. The next prime is 21343444351. The reversal of 21343444344 is 44344434312.

21343444344 is a `hidden beast` number, since 213 + 4 + 3 + 4 + 4 + 434 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 = 21343444299 and 21343444308.

It is a congruent number.

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, 77544 + ... + 220680.

Almost surely, 2^21343444344 is an apocalyptic number.

21343444344 is a gapful number since it is divisible by the number (24) 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 21343444344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30703101000).

21343444344 is an abundant number, since it is smaller than the sum of its proper divisors (40062757656).

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

21343444344 is a wasteful number, since it uses less digits than its factorization.

21343444344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143277 (or 143270 counting only the distinct ones).

The product of its digits is 221184, while the sum is 36.

Adding to 21343444344 its reverse (44344434312), we get a palindrome (65687878656).

The spelling of 21343444344 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-four thousand, three hundred forty-four".