221102111200121 has 12 divisors (see below), whose sum is σ = 233353099548900. Its totient is φ = 209463754159008.

The previous prime is 221102111200067. The next prime is 221102111200123. The reversal of 221102111200121 is 121002111201122.

It can be written as a sum of positive squares in 2 ways, for example, as 61821658155625 + 159280453044496 = 7862675^2 + 12620636^2 .

It is not a de Polignac number, because 221102111200121 - 2⁴² = 216704064689017 is a prime.

It is a super-2 number, since 2×221102111200121² (a number of 29 digits) contains 22 as substring.

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 221102111200121.

It is not an unprimeable number, because it can be changed into a prime (221102111200123) 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 11 ways as a sum of consecutive naturals, for example, 54005075 + ... + 57954743.

It is an arithmetic number, because the mean of its divisors is an integer number (19446091629075).

Almost surely, 2^{221102111200121} is an apocalyptic number.

It is an amenable number.

221102111200121 is a deficient number, since it is larger than the sum of its proper divisors (12250988348779).

221102111200121 is a wasteful number, since it uses less digits than its factorization.

221102111200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4104776 (or 4104757 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221102111200121 its reverse (121002111201122), we get a palindrome (342104222401243).

The spelling of 221102111200121 in words is "two hundred twenty-one trillion, one hundred two billion, one hundred eleven million, two hundred thousand, one hundred twenty-one".