121811117 has 4 divisors (see below), whose sum is σ = 121838496. Its totient is φ = 121783740.

The previous prime is 121811087. The next prime is 121811167. The reversal of 121811117 is 711118121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121811117 - 2¹⁶ = 121745581 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121811092 and 121811101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121811167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5303 + ... + 16484.

It is an arithmetic number, because the mean of its divisors is an integer number (30459624).

Almost surely, 2^121811117 is an apocalyptic number.

It is an amenable number.

121811117 is a deficient number, since it is larger than the sum of its proper divisors (27379).

121811117 is an equidigital number, since it uses as much as digits as its factorization.

121811117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27378.

The product of its digits is 112, while the sum is 23.

The square root of 121811117 is about 11036.8073735116. The cubic root of 121811117 is about 495.7114783264.

Adding to 121811117 its reverse (711118121), we get a palindrome (832929238).

The spelling of 121811117 in words is "one hundred twenty-one million, eight hundred eleven thousand, one hundred seventeen".