111021216 has 48 divisors (see below), whose sum is σ = 292499424. Its totient is φ = 36871424.

The previous prime is 111021151. The next prime is 111021223. The reversal of 111021216 is 612120111.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 111021195 and 111021204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26155 + ... + 30101.

It is an arithmetic number, because the mean of its divisors is an integer number (6093738).

Almost surely, 2^111021216 is an apocalyptic number.

111021216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

111021216 is an abundant number, since it is smaller than the sum of its proper divisors (181478208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111021216 is a wasteful number, since it uses less digits than its factorization.

111021216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4253 (or 4245 counting only the distinct ones).

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

The square root of 111021216 is about 10536.6605715473. The cubic root of 111021216 is about 480.6201706030.

Adding to 111021216 its reverse (612120111), we get a palindrome (723141327).

The spelling of 111021216 in words is "one hundred eleven million, twenty-one thousand, two hundred sixteen".