21222112200220 has 24 divisors (see below), whose sum is σ = 44566529271264. Its totient is φ = 8488827041856.

The previous prime is 21222112200139. The next prime is 21222112200221. The reversal of 21222112200220 is 2200221122212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222112200221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12997782 + ... + 14539138.

It is an arithmetic number, because the mean of its divisors is an integer number (1856938719636).

Almost surely, 2^{21222112200220} is an apocalyptic number.

21222112200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222112200220 is an abundant number, since it is smaller than the sum of its proper divisors (23344417071044).

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

21222112200220 is a wasteful number, since it uses less digits than its factorization.

21222112200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229789 (or 2229787 counting only the distinct ones).

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

Adding to 21222112200220 its reverse (2200221122212), we get a palindrome (23422333322432).

The spelling of 21222112200220 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, two hundred thousand, two hundred twenty".