221111112122 has 24 divisors (see below), whose sum is σ = 348718342644. Its totient is φ = 105137441024.

The previous prime is 221111112113. The next prime is 221111112127. The reversal of 221111112122 is 221211111122.

It can be written as a sum of positive squares in 2 ways, for example, as 156553957561 + 64557154561 = 395669^2 + 254081^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 221111112122.

It is not an unprimeable number, because it can be changed into a prime (221111112127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 420983 + ... + 787050.

Almost surely, 2^221111112122 is an apocalyptic number.

221111112122 is a deficient number, since it is larger than the sum of its proper divisors (127607230522).

221111112122 is a wasteful number, since it uses less digits than its factorization.

221111112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208254 (or 1208231 counting only the distinct ones).

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

Adding to 221111112122 its reverse (221211111122), we get a palindrome (442322223244).

The spelling of 221111112122 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-two".