121321873 has 2 divisors, whose sum is σ = 121321874. Its totient is φ = 121321872.

The previous prime is 121321867. The next prime is 121321891. The reversal of 121321873 is 378123121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90497169 + 30824704 = 9513^2 + 5552^2 .

It is an emirp because it is prime and its reverse (378123121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121321873 is a prime.

It is not a weakly prime, because it can be changed into another prime (121321373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660936 + 60660937.

It is an arithmetic number, because the mean of its divisors is an integer number (60660937).

Almost surely, 2^121321873 is an apocalyptic number.

It is an amenable number.

121321873 is a deficient number, since it is larger than the sum of its proper divisors (1).

121321873 is an equidigital number, since it uses as much as digits as its factorization.

121321873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 121321873 is about 11014.6208740928. The cubic root of 121321873 is about 495.0469268166.

Adding to 121321873 its reverse (378123121), we get a palindrome (499444994).

The spelling of 121321873 in words is "one hundred twenty-one million, three hundred twenty-one thousand, eight hundred seventy-three".