222222111001220 has 192 divisors, whose sum is σ = 518580307365120. Its totient is φ = 79315299532800.

The previous prime is 222222111001159. The next prime is 222222111001349. The reversal of 222222111001220 is 22100111222222.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 222222111001192 and 222222111001201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3414094436 + ... + 3414159524.

It is an arithmetic number, because the mean of its divisors is an integer number (2700939100860).

Almost surely, 2^{222222111001220} is an apocalyptic number.

222222111001220 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 222222111001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259290153682560).

222222111001220 is an abundant number, since it is smaller than the sum of its proper divisors (296358196363900).

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

222222111001220 is a wasteful number, since it uses less digits than its factorization.

222222111001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66406 (or 66404 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 222222111001220 its reverse (22100111222222), we get a palindrome (244322222223442).

The spelling of 222222111001220 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, one hundred eleven million, one thousand, two hundred twenty".