1220203021121 has 8 divisors (see below), whose sum is σ = 1395493619520. Its totient is φ = 1045156393008.

The previous prime is 1220203021111. The next prime is 1220203021159. The reversal of 1220203021121 is 1211203020221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1220203021121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220203021121.

It is not an unprimeable number, because it can be changed into a prime (1220203021111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60981851 + ... + 61001856.

It is an arithmetic number, because the mean of its divisors is an integer number (174436702440).

Almost surely, 2^{1220203021121} is an apocalyptic number.

It is an amenable number.

1220203021121 is a deficient number, since it is larger than the sum of its proper divisors (175290598399).

1220203021121 is a wasteful number, since it uses less digits than its factorization.

1220203021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121985143.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1220203021121 its reverse (1211203020221), we get a palindrome (2431406041342).

The spelling of 1220203021121 in words is "one trillion, two hundred twenty billion, two hundred three million, twenty-one thousand, one hundred twenty-one".