321920411 has 2 divisors, whose sum is σ = 321920412. Its totient is φ = 321920410.

The previous prime is 321920393. The next prime is 321920413. The reversal of 321920411 is 114029123.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321920411 is a prime.

Together with 321920413, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321920413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160960205 + 160960206.

It is an arithmetic number, because the mean of its divisors is an integer number (160960206).

Almost surely, 2^321920411 is an apocalyptic number.

321920411 is a deficient number, since it is larger than the sum of its proper divisors (1).

321920411 is an equidigital number, since it uses as much as digits as its factorization.

321920411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 321920411 is about 17942.1406470911. The cubic root of 321920411 is about 685.3559242178.

Adding to 321920411 its reverse (114029123), we get a palindrome (435949534).

The spelling of 321920411 in words is "three hundred twenty-one million, nine hundred twenty thousand, four hundred eleven".