221112110221 has 4 divisors (see below), whose sum is σ = 221113381372. Its totient is φ = 221110839072.

The previous prime is 221112110213. The next prime is 221112110231. The reversal of 221112110221 is 122011211122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 183963788100 + 37148322121 = 428910^2 + 192739^2 .

It is a cyclic number.

It is not a de Polignac number, because 221112110221 - 2³ = 221112110213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221112110195 and 221112110204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112110231) 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, 323616 + ... + 739561.

It is an arithmetic number, because the mean of its divisors is an integer number (55278345343).

Almost surely, 2^221112110221 is an apocalyptic number.

It is an amenable number.

221112110221 is a deficient number, since it is larger than the sum of its proper divisors (1271151).

221112110221 is a wasteful number, since it uses less digits than its factorization.

221112110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271150.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221112110221 its reverse (122011211122), we get a palindrome (343123321343).

The spelling of 221112110221 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred ten thousand, two hundred twenty-one".