121111231 has 2 divisors, whose sum is σ = 121111232. Its totient is φ = 121111230.

The previous prime is 121111189. The next prime is 121111259. The reversal of 121111231 is 132111121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (132111121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121111231 - 2⁷ = 121111103 is a prime.

It is a super-2 number, since 2×121111231² = 29335860548670722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121111271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555615 + 60555616.

It is an arithmetic number, because the mean of its divisors is an integer number (60555616).

Almost surely, 2^121111231 is an apocalyptic number.

121111231 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111231 is an equidigital number, since it uses as much as digits as its factorization.

121111231 is an evil number, because the sum of its binary digits is even.

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

The square root of 121111231 is about 11005.0547931394. The cubic root of 121111231 is about 494.7602566549.

Adding to 121111231 its reverse (132111121), we get a palindrome (253222352).

The spelling of 121111231 in words is "one hundred twenty-one million, one hundred eleven thousand, two hundred thirty-one".