1221102011201 has 4 divisors (see below), whose sum is σ = 1221189666132. Its totient is φ = 1221014356272.

The previous prime is 1221102011179. The next prime is 1221102011209. The reversal of 1221102011201 is 1021102011221.

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 1072568851201 + 148533160000 = 1035649^2 + 385400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221102011201 - 2¹⁸ = 1221101749057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221102011209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43806566 + ... + 43834431.

It is an arithmetic number, because the mean of its divisors is an integer number (305297416533).

Almost surely, 2^{1221102011201} is an apocalyptic number.

It is an amenable number.

1221102011201 is a deficient number, since it is larger than the sum of its proper divisors (87654931).

1221102011201 is an equidigital number, since it uses as much as digits as its factorization.

1221102011201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87654930.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221102011201 its reverse (1021102011221), we get a palindrome (2242204022422).

It can be divided in two parts, 12211020 and 11201, that added together give a palindrome (12222221).

The spelling of 1221102011201 in words is "one trillion, two hundred twenty-one billion, one hundred two million, eleven thousand, two hundred one".