12121231 has 2 divisors, whose sum is σ = 12121232. Its totient is φ = 12121230.

The previous prime is 12121211. The next prime is 12121267. The reversal of 12121231 is 13212121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12121231 - 2⁷ = 12121103 is a prime.

It is a super-2 number, since 2×12121231² = 293848481910722, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060615 + 6060616.

It is an arithmetic number, because the mean of its divisors is an integer number (6060616).

Almost surely, 2^12121231 is an apocalyptic number.

12121231 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121231 is an equidigital number, since it uses as much as digits as its factorization.

12121231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 13.

The square root of 12121231 is about 3481.5558303724. Note that the first 3 decimals coincide. The cubic root of 12121231 is about 229.7112381192.

Adding to 12121231 its reverse (13212121), we get a palindrome (25333352).

The spelling of 12121231 in words is "twelve million, one hundred twenty-one thousand, two hundred thirty-one".