1220112021121 has 6 divisors (see below), whose sum is σ = 1419313983810. Its totient is φ = 1045810303776.

The previous prime is 1220112021013. The next prime is 1220112021179. The reversal of 1220112021121 is 1211202110221.

It can be written as a sum of positive squares in only one way, i.e., 843754310721 + 376357710400 = 918561^2 + 613480^2 .

It is not a de Polignac number, because 1220112021121 - 2¹³ = 1220112012929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220112021095 and 1220112021104.

It is not an unprimeable number, because it can be changed into a prime (1220112021221) 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 5 ways as a sum of consecutive naturals, for example, 12450122616 + ... + 12450122713.

It is an arithmetic number, because the mean of its divisors is an integer number (236552330635).

Almost surely, 2^{1220112021121} is an apocalyptic number.

It is an amenable number.

1220112021121 is a deficient number, since it is larger than the sum of its proper divisors (199201962689).

1220112021121 is an equidigital number, since it uses as much as digits as its factorization.

1220112021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24900245343 (or 24900245336 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1220112021121 its reverse (1211202110221), we get a palindrome (2431314131342).

The spelling of 1220112021121 in words is "one trillion, two hundred twenty billion, one hundred twelve million, twenty-one thousand, one hundred twenty-one".