121111121 has 2 divisors, whose sum is σ = 121111122. Its totient is φ = 121111120.

The previous prime is 121111103. The next prime is 121111127.

121111121 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120670225 + 440896 = 10985^2 + 664^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 121111121 - 2²⁶ = 54002257 is a prime.

It is not a weakly prime, because it can be changed into another prime (121111127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555560 + 60555561.

It is an arithmetic number, because the mean of its divisors is an integer number (60555561).

Almost surely, 2^121111121 is an apocalyptic number.

It is an amenable number.

121111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111121 is an equidigital number, since it uses as much as digits as its factorization.

121111121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4, while the sum is 11.

The square root of 121111121 is about 11005.0497954348. The cubic root of 121111121 is about 494.7601068652.

Multiplying 121111121 by its sum of digits (11), we get a palindrome (1332222331).

The spelling of 121111121 in words is "one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".