312130123421 has 2 divisors, whose sum is σ = 312130123422. Its totient is φ = 312130123420.

The previous prime is 312130123373. The next prime is 312130123423. The reversal of 312130123421 is 124321031213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212014202500 + 100115920921 = 460450^2 + 316411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312130123421 is a prime.

Together with 312130123423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312130123423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156065061710 + 156065061711.

It is an arithmetic number, because the mean of its divisors is an integer number (156065061711).

Almost surely, 2^312130123421 is an apocalyptic number.

It is an amenable number.

312130123421 is a deficient number, since it is larger than the sum of its proper divisors (1).

312130123421 is an equidigital number, since it uses as much as digits as its factorization.

312130123421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 312130123421 its reverse (124321031213), we get a palindrome (436451154634).

The spelling of 312130123421 in words is "three hundred twelve billion, one hundred thirty million, one hundred twenty-three thousand, four hundred twenty-one".