121211231 has 2 divisors, whose sum is σ = 121211232. Its totient is φ = 121211230.

The previous prime is 121211227. The next prime is 121211243. The reversal of 121211231 is 132112121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121211231 - 2² = 121211227 is a prime.

It is a super-2 number, since 2×121211231² = 29384325041070722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121211221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605615 + 60605616.

It is an arithmetic number, because the mean of its divisors is an integer number (60605616).

Almost surely, 2^121211231 is an apocalyptic number.

121211231 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211231 is an equidigital number, since it uses as much as digits as its factorization.

121211231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 14.

The square root of 121211231 is about 11009.5972224237. The cubic root of 121211231 is about 494.8963916064.

Adding to 121211231 its reverse (132112121), we get a palindrome (253323352).

The spelling of 121211231 in words is "one hundred twenty-one million, two hundred eleven thousand, two hundred thirty-one".