21803381500 has 24 divisors (see below), whose sum is σ = 47618586288. Its totient is φ = 8721352400.

The previous prime is 21803381449. The next prime is 21803381503. The reversal of 21803381500 is 518330812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21803381503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21802882 + ... + 21803881.

It is an arithmetic number, because the mean of its divisors is an integer number (1984107762).

Almost surely, 2^21803381500 is an apocalyptic number.

21803381500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21803381500 is an abundant number, since it is smaller than the sum of its proper divisors (25815204788).

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

21803381500 is a wasteful number, since it uses less digits than its factorization.

21803381500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43606782 (or 43606770 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 21803381500 in words is "twenty-one billion, eight hundred three million, three hundred eighty-one thousand, five hundred".