111101221 has 8 divisors (see below), whose sum is σ = 138515904. Its totient is φ = 86572320.

The previous prime is 111101173. The next prime is 111101311. The reversal of 111101221 is 122101111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111101221 - 2⁹ = 111100709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111101198 and 111101207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111101821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721360 + ... + 721513.

It is an arithmetic number, because the mean of its divisors is an integer number (17314488).

Almost surely, 2^111101221 is an apocalyptic number.

111101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111101221 is a deficient number, since it is larger than the sum of its proper divisors (27414683).

111101221 is a wasteful number, since it uses less digits than its factorization.

111101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442891.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 111101221 is about 10540.4563942934. The cubic root of 111101221 is about 480.7355923374.

Adding to 111101221 its reverse (122101111), we get a palindrome (233202332).

The spelling of 111101221 in words is "one hundred eleven million, one hundred one thousand, two hundred twenty-one".