112121111 has 4 divisors (see below), whose sum is σ = 113959224. Its totient is φ = 110283000.

The previous prime is 112121099. The next prime is 112121117. The reversal of 112121111 is 111121211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-112121111 is a prime.

It is a super-2 number, since 2×112121111² = 25142287063748642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 112121092 and 112121101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112121117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918965 + ... + 919086.

It is an arithmetic number, because the mean of its divisors is an integer number (28489806).

Almost surely, 2^112121111 is an apocalyptic number.

112121111 is a deficient number, since it is larger than the sum of its proper divisors (1838113).

112121111 is an equidigital number, since it uses as much as digits as its factorization.

112121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838112.

The product of its digits is 4, while the sum is 11.

The square root of 112121111 is about 10588.7256551485. The cubic root of 112121111 is about 482.2021371146.

Adding to 112121111 its reverse (111121211), we get a palindrome (223242322).

It can be divided in two parts, 1121211 and 11, that multiplied together give a palindrome (12333321).

The spelling of 112121111 in words is "one hundred twelve million, one hundred twenty-one thousand, one hundred eleven".