1222222120 has 128 divisors (see below), whose sum is σ = 3415449600. Its totient is φ = 384134400.

The previous prime is 1222222103. The next prime is 1222222121. The reversal of 1222222120 is 212222221.

It is a junction number, because it is equal to n+sod(n) for n = 1222222094 and 1222222103.

It is not an unprimeable number, because it can be changed into a prime (1222222121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161215 + ... + 168625.

It is an arithmetic number, because the mean of its divisors is an integer number (26683200).

Almost surely, 2^1222222120 is an apocalyptic number.

1222222120 is a gapful number since it is divisible by the number (10) 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 1222222120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1707724800).

1222222120 is an abundant number, since it is smaller than the sum of its proper divisors (2193227480).

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

1222222120 is a wasteful number, since it uses less digits than its factorization.

1222222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7479 (or 7475 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1222222120 is about 34960.2934770291. The cubic root of 1222222120 is about 1069.1780801912.

Adding to 1222222120 its reverse (212222221), we get a palindrome (1434444341).

The spelling of 1222222120 in words is "one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty".