111220121 has 8 divisors (see below), whose sum is σ = 112532160. Its totient is φ = 109912752.

The previous prime is 111220117. The next prime is 111220127. The reversal of 111220121 is 121022111.

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 111220121 - 2² = 111220117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111220127) 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, 72266 + ... + 73788.

It is an arithmetic number, because the mean of its divisors is an integer number (14066520).

Almost surely, 2^111220121 is an apocalyptic number.

It is an amenable number.

111220121 is a deficient number, since it is larger than the sum of its proper divisors (1312039).

111220121 is a wasteful number, since it uses less digits than its factorization.

111220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 111220121 is about 10546.0950593099. The cubic root of 111220121 is about 480.9070248471.

Adding to 111220121 its reverse (121022111), we get a palindrome (232242232).

The spelling of 111220121 in words is "one hundred eleven million, two hundred twenty thousand, one hundred twenty-one".