21033132500 has 60 divisors (see below), whose sum is σ = 46326920640. Its totient is φ = 8352588000.

The previous prime is 21033132493. The next prime is 21033132503. The reversal of 21033132500 is 523133012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033132503) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 317237 + ... + 377763.

It is an arithmetic number, because the mean of its divisors is an integer number (772115344).

Almost surely, 2^21033132500 is an apocalyptic number.

21033132500 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 21033132500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23163460320).

21033132500 is an abundant number, since it is smaller than the sum of its proper divisors (25293788140).

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

21033132500 is a wasteful number, since it uses less digits than its factorization.

21033132500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60690 (or 60673 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

Adding to 21033132500 its reverse (523133012), we get a palindrome (21556265512).

The spelling of 21033132500 in words is "twenty-one billion, thirty-three million, one hundred thirty-two thousand, five hundred".