21210022200 has 96 divisors (see below), whose sum is σ = 65799025200. Its totient is φ = 5651880960.

The previous prime is 21210022199. The next prime is 21210022213. The reversal of 21210022200 is 222001212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 859636 + ... + 883964.

Almost surely, 2^21210022200 is an apocalyptic number.

21210022200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210022200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32899512600).

21210022200 is an abundant number, since it is smaller than the sum of its proper divisors (44589003000).

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

21210022200 is a wasteful number, since it uses less digits than its factorization.

21210022200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25801 (or 25792 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21210022200 its reverse (222001212), we get a palindrome (21432023412).

The spelling of 21210022200 in words is "twenty-one billion, two hundred ten million, twenty-two thousand, two hundred".