111101111221 has 8 divisors (see below), whose sum is σ = 111904152480. Its totient is φ = 110300096592.

The previous prime is 111101111207. The next prime is 111101111243. The reversal of 111101111221 is 122111101111.

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 111101111221 - 2⁹ = 111101110709 is a prime.

It is a super-2 number, since 2×111101111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111101111201) 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, 396535 + ... + 615988.

It is an arithmetic number, because the mean of its divisors is an integer number (13988019060).

Almost surely, 2^111101111221 is an apocalyptic number.

It is an amenable number.

111101111221 is a deficient number, since it is larger than the sum of its proper divisors (803041259).

111101111221 is a wasteful number, since it uses less digits than its factorization.

111101111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013315.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 111101111221 its reverse (122111101111), we get a palindrome (233212212332).

The spelling of 111101111221 in words is "one hundred eleven billion, one hundred one million, one hundred eleven thousand, two hundred twenty-one".