21222222111120 has 320 divisors, whose sum is σ = 70435179360000. Its totient is φ = 5270503292928.

The previous prime is 21222222111119. The next prime is 21222222111173. The reversal of 21222222111120 is 2111122222212.

It is a super-2 number, since 2×21222222111120² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 65744676 + ... + 66066684.

It is an arithmetic number, because the mean of its divisors is an integer number (220109935500).

Almost surely, 2^{21222222111120} is an apocalyptic number.

21222222111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222222111120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35217589680000).

21222222111120 is an abundant number, since it is smaller than the sum of its proper divisors (49212957248880).

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

21222222111120 is a wasteful number, since it uses less digits than its factorization.

21222222111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322290 (or 322284 counting only the distinct ones).

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

Adding to 21222222111120 its reverse (2111122222212), we get a palindrome (23333344333332).

The spelling of 21222222111120 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-two million, one hundred eleven thousand, one hundred twenty".