21343233320 has 64 divisors (see below), whose sum is σ = 49146134400. Its totient is φ = 8339708160.

The previous prime is 21343233313. The next prime is 21343233361. The reversal of 21343233320 is 2333234312.

It is a self number, because there is not a number n which added to its sum of digits gives 21343233320.

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 15 ways as a sum of consecutive naturals, for example, 275087 + ... + 344033.

It is an arithmetic number, because the mean of its divisors is an integer number (767908350).

Almost surely, 2^21343233320 is an apocalyptic number.

21343233320 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 21343233320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24573067200).

21343233320 is an abundant number, since it is smaller than the sum of its proper divisors (27802901080).

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

21343233320 is a wasteful number, since it uses less digits than its factorization.

21343233320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69138 (or 69134 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 26.

Adding to 21343233320 its reverse (2333234312), we get a palindrome (23676467632).

The spelling of 21343233320 in words is "twenty-one billion, three hundred forty-three million, two hundred thirty-three thousand, three hundred twenty".