121321111 has 4 divisors (see below), whose sum is σ = 121782672. Its totient is φ = 120859552.

The previous prime is 121321097. The next prime is 121321127. The reversal of 121321111 is 111123121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121321111 - 2¹¹ = 121319063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121321091 and 121321100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121325111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230386 + ... + 230911.

It is an arithmetic number, because the mean of its divisors is an integer number (30445668).

Almost surely, 2^121321111 is an apocalyptic number.

121321111 is a deficient number, since it is larger than the sum of its proper divisors (461561).

121321111 is an equidigital number, since it uses as much as digits as its factorization.

121321111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461560.

The product of its digits is 12, while the sum is 13.

The square root of 121321111 is about 11014.5862836513. The cubic root of 121321111 is about 495.0458903821.

Adding to 121321111 its reverse (111123121), we get a palindrome (232444232).

The spelling of 121321111 in words is "one hundred twenty-one million, three hundred twenty-one thousand, one hundred eleven".