221221111112 has 32 divisors (see below), whose sum is σ = 446388806520. Its totient is φ = 102397424640.

The previous prime is 221221111093. The next prime is 221221111123. The reversal of 221221111112 is 211111122122.

It can be written as a sum of positive squares in 4 ways, for example, as 151574734276 + 69646376836 = 389326^2 + 263906^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13324703 + ... + 13341294.

Almost surely, 2^221221111112 is an apocalyptic number.

It is an amenable number.

221221111112 is an abundant number, since it is smaller than the sum of its proper divisors (225167695408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221221111112 is a wasteful number, since it uses less digits than its factorization.

221221111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26666081 (or 26666077 counting only the distinct ones).

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

Adding to 221221111112 its reverse (211111122122), we get a palindrome (432332233234).

The spelling of 221221111112 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, one hundred twelve".