1221102122201 has 16 divisors (see below), whose sum is σ = 1341153912000. Its totient is φ = 1104891375168.

The previous prime is 1221102122179. The next prime is 1221102122221. The reversal of 1221102122201 is 1022212011221.

It is a cyclic number.

It is not a de Polignac number, because 1221102122201 - 2¹⁰ = 1221102121177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221102122201.

It is not an unprimeable number, because it can be changed into a prime (1221102122221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2013191 + ... + 2548556.

It is an arithmetic number, because the mean of its divisors is an integer number (83822119500).

Almost surely, 2^{1221102122201} is an apocalyptic number.

It is an amenable number.

1221102122201 is a deficient number, since it is larger than the sum of its proper divisors (120051789799).

1221102122201 is a wasteful number, since it uses less digits than its factorization.

1221102122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4562168.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221102122201 its reverse (1022212011221), we get a palindrome (2243314133422).

The spelling of 1221102122201 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred twenty-two thousand, two hundred one".