21222112100200 has 72 divisors (see below), whose sum is σ = 54234773732790. Its totient is φ = 7717131664000.

The previous prime is 21222112100197. The next prime is 21222112100249. The reversal of 21222112100200 is 200121122212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 12840311222244 + 8381800877956 = 3583338^2 + 2895134^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 438449191 + ... + 438497590.

Almost surely, 2^{21222112100200} is an apocalyptic number.

21222112100200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222112100200 is an abundant number, since it is smaller than the sum of its proper divisors (33012661632590).

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

21222112100200 is a wasteful number, since it uses less digits than its factorization.

21222112100200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876946819 (or 876946799 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21222112100200 its reverse (200121122212), we get a palindrome (21422233222412).

It can be divided in two parts, 21222112 and 100200, that added together give a palindrome (21322312).

The spelling of 21222112100200 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, one hundred thousand, two hundred".