221102122102221 has 4 divisors (see below), whose sum is σ = 294802829469632. Its totient is φ = 147401414734812.

The previous prime is 221102122102139. The next prime is 221102122102289. The reversal of 221102122102221 is 122201221201122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 221102122102221 - 2⁹ = 221102122101709 is a prime.

It is a super-2 number, since 2×221102122102221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102122102621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36850353683701 + ... + 36850353683706.

It is an arithmetic number, because the mean of its divisors is an integer number (73700707367408).

Almost surely, 2^{221102122102221} is an apocalyptic number.

It is an amenable number.

221102122102221 is a deficient number, since it is larger than the sum of its proper divisors (73700707367411).

221102122102221 is an equidigital number, since it uses as much as digits as its factorization.

221102122102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73700707367410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221102122102221 its reverse (122201221201122), we get a palindrome (343303343303343).

The spelling of 221102122102221 in words is "two hundred twenty-one trillion, one hundred two billion, one hundred twenty-two million, one hundred two thousand, two hundred twenty-one".