12101231 has 4 divisors (see below), whose sum is σ = 12358752. Its totient is φ = 11843712.

The previous prime is 12101227. The next prime is 12101237. The reversal of 12101231 is 13210121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12101231 - 2² = 12101227 is a prime.

It is a super-2 number, since 2×12101231² = 292879583430722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128690 + ... + 128783.

It is an arithmetic number, because the mean of its divisors is an integer number (3089688).

Almost surely, 2^12101231 is an apocalyptic number.

12101231 is a deficient number, since it is larger than the sum of its proper divisors (257521).

12101231 is an equidigital number, since it uses as much as digits as its factorization.

12101231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257520.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 12101231 is about 3478.6823654942. The cubic root of 12101231 is about 229.5848275838.

Adding to 12101231 its reverse (13210121), we get a palindrome (25311352).

The spelling of 12101231 in words is "twelve million, one hundred one thousand, two hundred thirty-one".