111112001221 has 16 divisors (see below), whose sum is σ = 121229766000. Its totient is φ = 101227396608.

The previous prime is 111112001191. The next prime is 111112001233. The reversal of 111112001221 is 122100211111.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 25520062500 + 85591938721 = 159750^2 + 292561^2 .

It is not a de Polignac number, because 111112001221 - 2⁷ = 111112001093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111112001321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121425 + ... + 486793.

It is an arithmetic number, because the mean of its divisors is an integer number (7576860375).

Almost surely, 2^111112001221 is an apocalyptic number.

It is an amenable number.

111112001221 is a deficient number, since it is larger than the sum of its proper divisors (10117764779).

111112001221 is a wasteful number, since it uses less digits than its factorization.

111112001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365688.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111112001221 its reverse (122100211111), we get a palindrome (233212212332).

The spelling of 111112001221 in words is "one hundred eleven billion, one hundred twelve million, one thousand, two hundred twenty-one".