1221102202201 has 16 divisors (see below), whose sum is σ = 1425754455040. Its totient is φ = 1024209133200.

The previous prime is 1221102202169. The next prime is 1221102202211. The reversal of 1221102202201 is 1022022011221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221102202201 - 2⁵ = 1221102202169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221102202211) 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, 8550471 + ... + 8692108.

It is an arithmetic number, because the mean of its divisors is an integer number (89109653440).

Almost surely, 2^{1221102202201} is an apocalyptic number.

It is an amenable number.

1221102202201 is a deficient number, since it is larger than the sum of its proper divisors (204652252839).

1221102202201 is a wasteful number, since it uses less digits than its factorization.

1221102202201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17242804.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221102202201 its reverse (1022022011221), we get a palindrome (2243124213422).

It can be divided in two parts, 1221 and 102202201, that multiplied together give a palindrome (124788887421).

The spelling of 1221102202201 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred two thousand, two hundred one".