21200021222212 has 24 divisors (see below), whose sum is σ = 42400797151104. Its totient is φ = 9085561658112.

The previous prime is 21200021222173. The next prime is 21200021222231. The reversal of 21200021222212 is 21222212000212.

It is a self number, because there is not a number n which added to its sum of digits gives 21200021222212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5130568 + ... + 8289919.

It is an arithmetic number, because the mean of its divisors is an integer number (1766699881296).

Almost surely, 2^{21200021222212} is an apocalyptic number.

It is an amenable number.

21200021222212 is an abundant number, since it is smaller than the sum of its proper divisors (21200775928892).

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

21200021222212 is a wasteful number, since it uses less digits than its factorization.

21200021222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13476915 (or 13476913 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21200021222212 its reverse (21222212000212), we get a palindrome (42422233222424).

The spelling of 21200021222212 in words is "twenty-one trillion, two hundred billion, twenty-one million, two hundred twenty-two thousand, two hundred twelve".