21193873500 has 48 divisors (see below), whose sum is σ = 61716564000. Its totient is φ = 5651699200.

The previous prime is 21193873483. The next prime is 21193873507. The reversal of 21193873500 is 537839112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21193873507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7063125 + ... + 7066124.

It is an arithmetic number, because the mean of its divisors is an integer number (1285761750).

Almost surely, 2^21193873500 is an apocalyptic number.

21193873500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21193873500 is an abundant number, since it is smaller than the sum of its proper divisors (40522690500).

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

21193873500 is a wasteful number, since it uses less digits than its factorization.

21193873500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14129271 (or 14129259 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The spelling of 21193873500 in words is "twenty-one billion, one hundred ninety-three million, eight hundred seventy-three thousand, five hundred".