12312340401421 has 2 divisors, whose sum is σ = 12312340401422. Its totient is φ = 12312340401420.

The previous prime is 12312340401419. The next prime is 12312340401457. The reversal of 12312340401421 is 12410404321321.

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., 6918399181225 + 5393941220196 = 2630285^2 + 2322486^2 .

It is a cyclic number.

It is not a de Polignac number, because 12312340401421 - 2¹ = 12312340401419 is a prime.

It is a super-3 number, since 3×12312340401421³ (a number of 40 digits) contains 333 as substring.

Together with 12312340401419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12312340401421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12312340411421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6156170200710 + 6156170200711.

It is an arithmetic number, because the mean of its divisors is an integer number (6156170200711).

Almost surely, 2^{12312340401421} is an apocalyptic number.

It is an amenable number.

12312340401421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12312340401421 is an equidigital number, since it uses as much as digits as its factorization.

12312340401421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 12312340401421 its reverse (12410404321321), we get a palindrome (24722744722742).

The spelling of 12312340401421 in words is "twelve trillion, three hundred twelve billion, three hundred forty million, four hundred one thousand, four hundred twenty-one".