1220120202156 has 96 divisors (see below), whose sum is σ = 2897693326080. Its totient is φ = 399505572864.

The previous prime is 1220120202139. The next prime is 1220120202157. The reversal of 1220120202156 is 6512020210221.

It is not an unprimeable number, because it can be changed into a prime (1220120202157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 333455455 + ... + 333459113.

It is an arithmetic number, because the mean of its divisors is an integer number (30184305480).

Almost surely, 2^{1220120202156} is an apocalyptic number.

It is an amenable number.

1220120202156 is an abundant number, since it is smaller than the sum of its proper divisors (1677573123924).

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

1220120202156 is a wasteful number, since it uses less digits than its factorization.

1220120202156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5183 (or 5181 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 1220120202156 its reverse (6512020210221), we get a palindrome (7732140412377).

The spelling of 1220120202156 in words is "one trillion, two hundred twenty billion, one hundred twenty million, two hundred two thousand, one hundred fifty-six".