21221222112200 has 96 divisors (see below), whose sum is σ = 53942517056160. Its totient is φ = 7699921881600.

The previous prime is 21221222112163. The next prime is 21221222112227. The reversal of 21221222112200 is 221122212212.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 9548222 + ... + 11559021.

It is an arithmetic number, because the mean of its divisors is an integer number (561901219335).

Almost surely, 2^{21221222112200} is an apocalyptic number.

21221222112200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221222112200 is an abundant number, since it is smaller than the sum of its proper divisors (32721294943960).

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

21221222112200 is a wasteful number, since it uses less digits than its factorization.

21221222112200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21107727 (or 21107718 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21221222112200 its reverse (221122212212), we get a palindrome (21442344324412).

The spelling of 21221222112200 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, two hundred".