121311121 has 2 divisors, whose sum is σ = 121311122. Its totient is φ = 121311120.

The previous prime is 121311103. The next prime is 121311137. The reversal of 121311121 is 121113121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101606400 + 19704721 = 10080^2 + 4439^2 .

It is a cyclic number.

It is not a de Polignac number, because 121311121 - 2²⁵ = 87756689 is a prime.

It is not a weakly prime, because it can be changed into another prime (121351121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60655560 + 60655561.

It is an arithmetic number, because the mean of its divisors is an integer number (60655561).

Almost surely, 2^121311121 is an apocalyptic number.

It is an amenable number.

121311121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121311121 is an equidigital number, since it uses as much as digits as its factorization.

121311121 is an odious number, because the sum of its binary digits is odd.

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

The square root of 121311121 is about 11014.1327847452. The cubic root of 121311121 is about 495.0323020787.

Adding to 121311121 its reverse (121113121), we get a palindrome (242424242).

The spelling of 121311121 in words is "one hundred twenty-one million, three hundred eleven thousand, one hundred twenty-one".