221220112 has 10 divisors (see below), whose sum is σ = 428613998. Its totient is φ = 110610048.

The previous prime is 221220107. The next prime is 221220119. The reversal of 221220112 is 211022122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 171714816 + 49505296 = 13104^2 + 7036^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221220092 and 221220101.

It is not an unprimeable number, because it can be changed into a prime (221220119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6913113 + ... + 6913144.

Almost surely, 2^221220112 is an apocalyptic number.

It is an amenable number.

221220112 is a deficient number, since it is larger than the sum of its proper divisors (207393886).

221220112 is a wasteful number, since it uses less digits than its factorization.

221220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13826265 (or 13826259 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 221220112 is about 14873.4700725823. The cubic root of 221220112 is about 604.7950146795.

Adding to 221220112 its reverse (211022122), we get a palindrome (432242234).

The spelling of 221220112 in words is "two hundred twenty-one million, two hundred twenty thousand, one hundred twelve".