1220002120 has 32 divisors (see below), whose sum is σ = 2770198200. Its totient is φ = 483522048.

The previous prime is 1220002097. The next prime is 1220002139. The reversal of 1220002120 is 212000221.

1220002120 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1147989924 + 72012196 = 33882^2 + 8486^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1220002097 and 1220002106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135549 + ... + 144268.

Almost surely, 2^1220002120 is an apocalyptic number.

1220002120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220002120 is an abundant number, since it is smaller than the sum of its proper divisors (1550196080).

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

1220002120 is a wasteful number, since it uses less digits than its factorization.

1220002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279937 (or 279933 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1220002120 is about 34928.5287408445. The cubic root of 1220002120 is about 1068.5303490783.

Adding to 1220002120 its reverse (212000221), we get a palindrome (1432002341).

The spelling of 1220002120 in words is "one billion, two hundred twenty million, two thousand, one hundred twenty".