21431440200 has 48 divisors (see below), whose sum is σ = 66437466480. Its totient is φ = 5715050560.

The previous prime is 21431440189. The next prime is 21431440213. The reversal of 21431440200 is 204413412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17858934 + ... + 17860133.

It is an arithmetic number, because the mean of its divisors is an integer number (1384113885).

Almost surely, 2^21431440200 is an apocalyptic number.

21431440200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21431440200 is an abundant number, since it is smaller than the sum of its proper divisors (45006026280).

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

21431440200 is a wasteful number, since it uses less digits than its factorization.

21431440200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35719086 (or 35719077 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21431440200 its reverse (204413412), we get a palindrome (21635853612).

The spelling of 21431440200 in words is "twenty-one billion, four hundred thirty-one million, four hundred forty thousand, two hundred".