21223012200 has 96 divisors (see below), whose sum is σ = 70852236000. Its totient is φ = 5224124160.

The previous prime is 21223012169. The next prime is 21223012219. The reversal of 21223012200 is 221032212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21223012200.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1352650 + ... + 1368249.

It is an arithmetic number, because the mean of its divisors is an integer number (738044125).

Almost surely, 2^21223012200 is an apocalyptic number.

21223012200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223012200 is an abundant number, since it is smaller than the sum of its proper divisors (49629223800).

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

21223012200 is a wasteful number, since it uses less digits than its factorization.

21223012200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720931 (or 2720922 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21223012200 its reverse (221032212), we get a palindrome (21444044412).

The spelling of 21223012200 in words is "twenty-one billion, two hundred twenty-three million, twelve thousand, two hundred".