221202122201221 has 32 divisors (see below), whose sum is σ = 275520654950400. Its totient is φ = 173279761583040.

The previous prime is 221202122201213. The next prime is 221202122201237. The reversal of 221202122201221 is 122102221202122.

It is not a de Polignac number, because 221202122201221 - 2³ = 221202122201213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221202122201192 and 221202122201201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221202122211221) 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 31 ways as a sum of consecutive naturals, for example, 20170725 + ... + 29142106.

It is an arithmetic number, because the mean of its divisors is an integer number (8610020467200).

Almost surely, 2^{221202122201221} is an apocalyptic number.

It is an amenable number.

221202122201221 is a deficient number, since it is larger than the sum of its proper divisors (54318532749179).

221202122201221 is a wasteful number, since it uses less digits than its factorization.

221202122201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49314049.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221202122201221 its reverse (122102221202122), we get a palindrome (343304343403343).

Subtracting from 221202122201221 its reverse (122102221202122), we obtain a palindrome (99099900999099).

The spelling of 221202122201221 in words is "two hundred twenty-one trillion, two hundred two billion, one hundred twenty-two million, two hundred one thousand, two hundred twenty-one".