111100231221 has 32 divisors (see below), whose sum is σ = 170800896000. Its totient is φ = 62922899520.

The previous prime is 111100231213. The next prime is 111100231243. The reversal of 111100231221 is 122132001111.

It is not a de Polignac number, because 111100231221 - 2³ = 111100231213 is a prime.

It is a super-2 number, since 2×111100231221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111100231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111100235221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1716711 + ... + 1780251.

It is an arithmetic number, because the mean of its divisors is an integer number (5337528000).

Almost surely, 2^111100231221 is an apocalyptic number.

It is an amenable number.

111100231221 is a deficient number, since it is larger than the sum of its proper divisors (59700664779).

111100231221 is a wasteful number, since it uses less digits than its factorization.

111100231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64289.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 111100231221 its reverse (122132001111), we get a palindrome (233232232332).

The spelling of 111100231221 in words is "one hundred eleven billion, one hundred million, two hundred thirty-one thousand, two hundred twenty-one".