21212200200 has 48 divisors (see below), whose sum is σ = 65757822480. Its totient is φ = 5656586560.

The previous prime is 21212200187. The next prime is 21212200253. The reversal of 21212200200 is 200221212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17676234 + ... + 17677433.

It is an arithmetic number, because the mean of its divisors is an integer number (1369954635).

Almost surely, 2^21212200200 is an apocalyptic number.

21212200200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212200200 is an abundant number, since it is smaller than the sum of its proper divisors (44545622280).

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

21212200200 is a wasteful number, since it uses less digits than its factorization.

21212200200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35353686 (or 35353677 counting only the distinct ones).

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

Adding to 21212200200 its reverse (200221212), we get a palindrome (21412421412).

The spelling of 21212200200 in words is "twenty-one billion, two hundred twelve million, two hundred thousand, two hundred".