21204342200 has 48 divisors (see below), whose sum is σ = 49778785680. Its totient is φ = 8399381760.

The previous prime is 21204342169. The next prime is 21204342223. The reversal of 21204342200 is 224340212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 494069 + ... + 535268.

It is an arithmetic number, because the mean of its divisors is an integer number (1037058035).

Almost surely, 2^21204342200 is an apocalyptic number.

21204342200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21204342200 is an abundant number, since it is smaller than the sum of its proper divisors (28574443480).

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

21204342200 is a wasteful number, since it uses less digits than its factorization.

21204342200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029456 (or 1029447 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21204342200 its reverse (224340212), we get a palindrome (21428682412).

The spelling of 21204342200 in words is "twenty-one billion, two hundred four million, three hundred forty-two thousand, two hundred".