21041344500 has 192 divisors, whose sum is σ = 68106624768. Its totient is φ = 5004480000.

The previous prime is 21041344459. The next prime is 21041344543. The reversal of 21041344500 is 544314012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 862470 + ... + 886530.

It is an arithmetic number, because the mean of its divisors is an integer number (354722004).

Almost surely, 2^21041344500 is an apocalyptic number.

21041344500 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 21041344500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34053312384).

21041344500 is an abundant number, since it is smaller than the sum of its proper divisors (47065280268).

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

21041344500 is a wasteful number, since it uses less digits than its factorization.

21041344500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24147 (or 24135 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21041344500 its reverse (544314012), we get a palindrome (21585658512).

The spelling of 21041344500 in words is "twenty-one billion, forty-one million, three hundred forty-four thousand, five hundred".