21221102200 has 48 divisors (see below), whose sum is σ = 49694085000. Its totient is φ = 8427361920.

The previous prime is 21221102197. The next prime is 21221102209. The reversal of 21221102200 is 220112212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221102209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 353875 + ... + 409474.

Almost surely, 2^21221102200 is an apocalyptic number.

21221102200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221102200 is an abundant number, since it is smaller than the sum of its proper divisors (28472982800).

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

21221102200 is a wasteful number, since it uses less digits than its factorization.

21221102200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763504 (or 763495 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21221102200 its reverse (220112212), we get a palindrome (21441214412).

The spelling of 21221102200 in words is "twenty-one billion, two hundred twenty-one million, one hundred two thousand, two hundred".