121122121 has 4 divisors (see below), whose sum is σ = 121410244. Its totient is φ = 120834000.

The previous prime is 121122107. The next prime is 121122139. The reversal of 121122121 is 121221121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41216400 + 79905721 = 6420^2 + 8939^2 .

It is a cyclic number.

It is not a de Polignac number, because 121122121 - 2²³ = 112733513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121122151) 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, 143430 + ... + 144271.

It is an arithmetic number, because the mean of its divisors is an integer number (30352561).

Almost surely, 2^121122121 is an apocalyptic number.

It is an amenable number.

121122121 is a deficient number, since it is larger than the sum of its proper divisors (288123).

121122121 is an equidigital number, since it uses as much as digits as its factorization.

121122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288122.

The product of its digits is 16, while the sum is 13.

The square root of 121122121 is about 11005.5495546565. The cubic root of 121122121 is about 494.7750853863.

Adding to 121122121 its reverse (121221121), we get a palindrome (242343242).

It can be divided in two parts, 1211 and 22121, that added together give a palindrome (23332).

The spelling of 121122121 in words is "one hundred twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".