320404012421 has 2 divisors, whose sum is σ = 320404012422. Its totient is φ = 320404012420.

The previous prime is 320404012417. The next prime is 320404012471. The reversal of 320404012421 is 124210404023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 275866552900 + 44537459521 = 525230^2 + 211039^2 .

It is an emirp because it is prime and its reverse (124210404023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320404012421 - 2² = 320404012417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320404012471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160202006210 + 160202006211.

It is an arithmetic number, because the mean of its divisors is an integer number (160202006211).

Almost surely, 2^320404012421 is an apocalyptic number.

It is an amenable number.

320404012421 is a deficient number, since it is larger than the sum of its proper divisors (1).

320404012421 is an equidigital number, since it uses as much as digits as its factorization.

320404012421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 320404012421 its reverse (124210404023), we get a palindrome (444614416444).

The spelling of 320404012421 in words is "three hundred twenty billion, four hundred four million, twelve thousand, four hundred twenty-one".