1220011020121 has 4 divisors (see below), whose sum is σ = 1220032588852. Its totient is φ = 1219989451392.

The previous prime is 1220011020089. The next prime is 1220011020127. The reversal of 1220011020121 is 1210201100221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 681555918096 + 538455102025 = 825564^2 + 733795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220011020121 - 2⁵ = 1220011020089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220011020127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10699296 + ... + 10812721.

It is an arithmetic number, because the mean of its divisors is an integer number (305008147213).

Almost surely, 2^{1220011020121} is an apocalyptic number.

It is an amenable number.

1220011020121 is a deficient number, since it is larger than the sum of its proper divisors (21568731).

1220011020121 is an equidigital number, since it uses as much as digits as its factorization.

1220011020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21568730.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1220011020121 its reverse (1210201100221), we get a palindrome (2430212120342).

The spelling of 1220011020121 in words is "one trillion, two hundred twenty billion, eleven million, twenty thousand, one hundred twenty-one".