111100021221 has 16 divisors (see below), whose sum is σ = 169897753728. Its totient is φ = 63259795200.

The previous prime is 111100021217. The next prime is 111100021223. The reversal of 111100021221 is 122120001111.

It is not a de Polignac number, because 111100021221 - 2² = 111100021217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111100021197 and 111100021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111100021223) 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, 9407760 + ... + 9419561.

It is an arithmetic number, because the mean of its divisors is an integer number (10618609608).

Almost surely, 2^111100021221 is an apocalyptic number.

It is an amenable number.

111100021221 is a deficient number, since it is larger than the sum of its proper divisors (58797732507).

111100021221 is a wasteful number, since it uses less digits than its factorization.

111100021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18827612.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111100021221 its reverse (122120001111), we get a palindrome (233220022332).

The spelling of 111100021221 in words is "one hundred eleven billion, one hundred million, twenty-one thousand, two hundred twenty-one".