21343203336 has 192 divisors, whose sum is σ = 66348011520. Its totient is φ = 5602072320.

The previous prime is 21343203311. The next prime is 21343203337. The reversal of 21343203336 is 63330234312.

It is not an unprimeable number, because it can be changed into a prime (21343203337) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6329731 + ... + 6333101.

It is an arithmetic number, because the mean of its divisors is an integer number (345562560).

Almost surely, 2^21343203336 is an apocalyptic number.

21343203336 is a gapful number since it is divisible by the number (26) 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 21343203336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33174005760).

21343203336 is an abundant number, since it is smaller than the sum of its proper divisors (45004808184).

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

21343203336 is a wasteful number, since it uses less digits than its factorization.

21343203336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636 (or 3619 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 30.

Adding to 21343203336 its reverse (63330234312), we get a palindrome (84673437648).

The spelling of 21343203336 in words is "twenty-one billion, three hundred forty-three million, two hundred three thousand, three hundred thirty-six".