121112121 has 8 divisors (see below), whose sum is σ = 173904640. Its totient is φ = 74530512.

The previous prime is 121112113. The next prime is 121112129. The reversal of 121112121 is 121211121.

It is an interprime number because it is at equal distance from previous prime (121112113) and next prime (121112129).

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

It is not a de Polignac number, because 121112121 - 2³ = 121112113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121112097 and 121112106.

It is not an unprimeable number, because it can be changed into a prime (121112129) 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, 1552681 + ... + 1552758.

It is an arithmetic number, because the mean of its divisors is an integer number (21738080).

Almost surely, 2^121112121 is an apocalyptic number.

It is an amenable number.

121112121 is a deficient number, since it is larger than the sum of its proper divisors (52792519).

121112121 is a wasteful number, since it uses less digits than its factorization.

121112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3105455.

The product of its digits is 8, while the sum is 12.

The square root of 121112121 is about 11005.0952290291. The cubic root of 121112121 is about 494.7614685864.

Adding to 121112121 its reverse (121211121), we get a palindrome (242323242).

The spelling of 121112121 in words is "one hundred twenty-one million, one hundred twelve thousand, one hundred twenty-one".