321638999041 has 2 divisors, whose sum is σ = 321638999042. Its totient is φ = 321638999040.

The previous prime is 321638999021. The next prime is 321638999051. The reversal of 321638999041 is 140999836123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 288230470641 + 33408528400 = 536871^2 + 182780^2 .

It is an emirp because it is prime and its reverse (140999836123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321638999041 - 2¹⁷ = 321638867969 is a prime.

It is not a weakly prime, because it can be changed into another prime (321638999021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160819499520 + 160819499521.

It is an arithmetic number, because the mean of its divisors is an integer number (160819499521).

Almost surely, 2^321638999041 is an apocalyptic number.

It is an amenable number.

321638999041 is a deficient number, since it is larger than the sum of its proper divisors (1).

321638999041 is an equidigital number, since it uses as much as digits as its factorization.

321638999041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The spelling of 321638999041 in words is "three hundred twenty-one billion, six hundred thirty-eight million, nine hundred ninety-nine thousand, forty-one".