321438121 has 2 divisors, whose sum is σ = 321438122. Its totient is φ = 321438120.

The previous prime is 321438107. The next prime is 321438137. The reversal of 321438121 is 121834123.

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., 321305625 + 132496 = 17925^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 321438121 - 2⁷ = 321437993 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (321418121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160719060 + 160719061.

It is an arithmetic number, because the mean of its divisors is an integer number (160719061).

Almost surely, 2^321438121 is an apocalyptic number.

It is an amenable number.

321438121 is a deficient number, since it is larger than the sum of its proper divisors (1).

321438121 is an equidigital number, since it uses as much as digits as its factorization.

321438121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 321438121 is about 17928.6954628606. The cubic root of 321438121 is about 685.0134943263.

The spelling of 321438121 in words is "three hundred twenty-one million, four hundred thirty-eight thousand, one hundred twenty-one".