221110211121 has 8 divisors (see below), whose sum is σ = 294933127584. Its totient is φ = 147347051040.

The previous prime is 221110211107. The next prime is 221110211171. The reversal of 221110211121 is 121112011122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-221110211121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221110211121.

It is not an unprimeable number, because it can be changed into a prime (221110211171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14930460 + ... + 14945261.

It is an arithmetic number, because the mean of its divisors is an integer number (36866640948).

Almost surely, 2^221110211121 is an apocalyptic number.

It is an amenable number.

221110211121 is a deficient number, since it is larger than the sum of its proper divisors (73822916463).

221110211121 is a wasteful number, since it uses less digits than its factorization.

221110211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29878191.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221110211121 its reverse (121112011122), we get a palindrome (342222222243).

The spelling of 221110211121 in words is "two hundred twenty-one billion, one hundred ten million, two hundred eleven thousand, one hundred twenty-one".