21222112112220 has 96 divisors (see below), whose sum is σ = 60687616905216. Its totient is φ = 5538692339200.

The previous prime is 21222112112167. The next prime is 21222112112251. The reversal of 21222112112220 is 2221121122212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220027405 + ... + 220123835.

It is an arithmetic number, because the mean of its divisors is an integer number (632162676096).

Almost surely, 2^{21222112112220} is an apocalyptic number.

21222112112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222112112220 is an abundant number, since it is smaller than the sum of its proper divisors (39465504792996).

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

21222112112220 is a wasteful number, since it uses less digits than its factorization.

21222112112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174531 (or 174529 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21222112112220 its reverse (2221121122212), we get a palindrome (23443233234432).

The spelling of 21222112112220 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, one hundred twelve thousand, two hundred twenty".