21803440918 has 48 divisors (see below), whose sum is σ = 40093084080. Its totient is φ = 8842369536.

The previous prime is 21803440913. The next prime is 21803440921. The reversal of 21803440918 is 81904430812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21803440913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1738446 + ... + 1750942.

It is an arithmetic number, because the mean of its divisors is an integer number (835272585).

Almost surely, 2^21803440918 is an apocalyptic number.

21803440918 is a deficient number, since it is larger than the sum of its proper divisors (18289643162).

21803440918 is a wasteful number, since it uses less digits than its factorization.

21803440918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13469 (or 13462 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 21803440918 in words is "twenty-one billion, eight hundred three million, four hundred forty thousand, nine hundred eighteen".