221222120120 has 64 divisors (see below), whose sum is σ = 524302156800. Its totient is φ = 83774736000.

The previous prime is 221222120089. The next prime is 221222120129. The reversal of 221222120120 is 21021222122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222120129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1032245 + ... + 1227995.

It is an arithmetic number, because the mean of its divisors is an integer number (8192221200).

Almost surely, 2^221222120120 is an apocalyptic number.

221222120120 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 221222120120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262151078400).

221222120120 is an abundant number, since it is smaller than the sum of its proper divisors (303080036680).

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

221222120120 is a wasteful number, since it uses less digits than its factorization.

221222120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197268 (or 197264 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221222120120 its reverse (21021222122), we get a palindrome (242243342242).

The spelling of 221222120120 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, one hundred twenty".