111200121 has 20 divisors (see below), whose sum is σ = 167838132. Its totient is φ = 73363968.

The previous prime is 111200083. The next prime is 111200137. The reversal of 111200121 is 121002111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 46172025 + 65028096 = 6795^2 + 8064^2 .

It is not a de Polignac number, because 111200121 - 2¹⁹ = 110675833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (111200161) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 781 + ... + 14933.

Almost surely, 2^111200121 is an apocalyptic number.

It is an amenable number.

111200121 is a deficient number, since it is larger than the sum of its proper divisors (56638011).

111200121 is an equidigital number, since it uses as much as digits as its factorization.

111200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14262 (or 14253 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 111200121 is about 10545.1467984092. The cubic root of 111200121 is about 480.8781969786.

Adding to 111200121 its reverse (121002111), we get a palindrome (232202232).

The spelling of 111200121 in words is "one hundred eleven million, two hundred thousand, one hundred twenty-one".