100111111221 has 64 divisors (see below), whose sum is σ = 152319025152. Its totient is φ = 57960000000.

The previous prime is 100111111201. The next prime is 100111111259. The reversal of 100111111221 is 122111111001.

It is not a de Polignac number, because 100111111221 - 2⁶ = 100111111157 is a prime.

It is a super-2 number, since 2×100111111221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 100111111197 and 100111111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100111111201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11117721 + ... + 11126721.

It is an arithmetic number, because the mean of its divisors is an integer number (2379984768).

Almost surely, 2^100111111221 is an apocalyptic number.

100111111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100111111221 is a deficient number, since it is larger than the sum of its proper divisors (52207913931).

100111111221 is a wasteful number, since it uses less digits than its factorization.

100111111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9234.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 100111111221 its reverse (122111111001), we get a palindrome (222222222222).

The spelling of 100111111221 in words is "one hundred billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-one".