312011011321 has 2 divisors, whose sum is σ = 312011011322. Its totient is φ = 312011011320.

The previous prime is 312011011309. The next prime is 312011011343. The reversal of 312011011321 is 123110110213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308401404921 + 3609606400 = 555339^2 + 60080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312011011321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312011011295 and 312011011304.

It is not a weakly prime, because it can be changed into another prime (312011011421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156005505660 + 156005505661.

It is an arithmetic number, because the mean of its divisors is an integer number (156005505661).

Almost surely, 2^312011011321 is an apocalyptic number.

It is an amenable number.

312011011321 is a deficient number, since it is larger than the sum of its proper divisors (1).

312011011321 is an equidigital number, since it uses as much as digits as its factorization.

312011011321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 312011011321 its reverse (123110110213), we get a palindrome (435121121534).

The spelling of 312011011321 in words is "three hundred twelve billion, eleven million, eleven thousand, three hundred twenty-one".