221222111120 has 80 divisors (see below), whose sum is σ = 551158473600. Its totient is φ = 82280159232.

The previous prime is 221222111107. The next prime is 221222111179. The reversal of 221222111120 is 21111222122.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 867020 + ... + 1092779.

It is an arithmetic number, because the mean of its divisors is an integer number (6889480920).

Almost surely, 2^221222111120 is an apocalyptic number.

221222111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222111120 is an abundant number, since it is smaller than the sum of its proper divisors (329936362480).

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

221222111120 is a wasteful number, since it uses less digits than its factorization.

221222111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959912 (or 1959906 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221222111120 its reverse (21111222122), we get a palindrome (242333333242).

The spelling of 221222111120 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, one hundred twenty".