21323334500 has 384 divisors, whose sum is σ = 55794106368. Its totient is φ = 7051968000.

The previous prime is 21323334499. The next prime is 21323334503. The reversal of 21323334500 is 543332312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 21323334500.

It is not an unprimeable number, because it can be changed into a prime (21323334503) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 199283447 + ... + 199283553.

It is an arithmetic number, because the mean of its divisors is an integer number (145297152).

Almost surely, 2^21323334500 is an apocalyptic number.

21323334500 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 21323334500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27897053184).

21323334500 is an abundant number, since it is smaller than the sum of its proper divisors (34470771868).

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

21323334500 is a wasteful number, since it uses less digits than its factorization.

21323334500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 21323334500 its reverse (543332312), we get a palindrome (21866666812).

The spelling of 21323334500 in words is "twenty-one billion, three hundred twenty-three million, three hundred thirty-four thousand, five hundred".