323221421 has 2 divisors, whose sum is σ = 323221422. Its totient is φ = 323221420.

The previous prime is 323221403. The next prime is 323221439. The reversal of 323221421 is 124122323.

It is a balanced prime because it is at equal distance from previous prime (323221403) and next prime (323221439).

It can be written as a sum of positive squares in only one way, i.e., 240684196 + 82537225 = 15514^2 + 9085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-323221421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 323221393 and 323221402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (323221321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161610710 + 161610711.

It is an arithmetic number, because the mean of its divisors is an integer number (161610711).

Almost surely, 2^323221421 is an apocalyptic number.

It is an amenable number.

323221421 is a deficient number, since it is larger than the sum of its proper divisors (1).

323221421 is an equidigital number, since it uses as much as digits as its factorization.

323221421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 20.

The square root of 323221421 is about 17978.3597972674. The cubic root of 323221421 is about 686.2779496537.

Adding to 323221421 its reverse (124122323), we get a palindrome (447343744).

The spelling of 323221421 in words is "three hundred twenty-three million, two hundred twenty-one thousand, four hundred twenty-one".