12123010321 has 2 divisors, whose sum is σ = 12123010322. Its totient is φ = 12123010320.

The previous prime is 12123010313. The next prime is 12123010337. The reversal of 12123010321 is 12301032121.

It is an a-pointer prime, because the next prime (12123010337) can be obtained adding 12123010321 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10849305600 + 1273704721 = 104160^2 + 35689^2 .

It is a cyclic number.

It is not a de Polignac number, because 12123010321 - 2³ = 12123010313 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 12123010295 and 12123010304.

It is not a weakly prime, because it can be changed into another prime (12123020321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061505160 + 6061505161.

It is an arithmetic number, because the mean of its divisors is an integer number (6061505161).

Almost surely, 2^12123010321 is an apocalyptic number.

It is an amenable number.

12123010321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123010321 is an equidigital number, since it uses as much as digits as its factorization.

12123010321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 12123010321 its reverse (12301032121), we get a palindrome (24424042442).

The spelling of 12123010321 in words is "twelve billion, one hundred twenty-three million, ten thousand, three hundred twenty-one".