21222001012200 has 48 divisors (see below), whose sum is σ = 65788203139680. Its totient is φ = 5659200269760.

The previous prime is 21222001012183. The next prime is 21222001012253. The reversal of 21222001012200 is 221010022212.

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 21222001012200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17685000244 + ... + 17685001443.

It is an arithmetic number, because the mean of its divisors is an integer number (1370587565410).

Almost surely, 2^{21222001012200} is an apocalyptic number.

21222001012200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222001012200 is an abundant number, since it is smaller than the sum of its proper divisors (44566202127480).

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

21222001012200 is a wasteful number, since it uses less digits than its factorization.

21222001012200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35370001706 (or 35370001697 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222001012200 its reverse (221010022212), we get a palindrome (21443011034412).

The spelling of 21222001012200 in words is "twenty-one trillion, two hundred twenty-two billion, one million, twelve thousand, two hundred".