320131421 has 2 divisors, whose sum is σ = 320131422. Its totient is φ = 320131420.

The previous prime is 320131397. The next prime is 320131423. The reversal of 320131421 is 124131023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218625796 + 101505625 = 14786^2 + 10075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320131421 is a prime.

It is a super-2 number, since 2×320131421² = 204968253422958482, which contains 22 as substring.

Together with 320131423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320131421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320131423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160065710 + 160065711.

It is an arithmetic number, because the mean of its divisors is an integer number (160065711).

Almost surely, 2^320131421 is an apocalyptic number.

It is an amenable number.

320131421 is a deficient number, since it is larger than the sum of its proper divisors (1).

320131421 is an equidigital number, since it uses as much as digits as its factorization.

320131421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 320131421 is about 17892.2167715462. The cubic root of 320131421 is about 684.0840020005.

Adding to 320131421 its reverse (124131023), we get a palindrome (444262444).

The spelling of 320131421 in words is "three hundred twenty million, one hundred thirty-one thousand, four hundred twenty-one".