100203440321 has 2 divisors, whose sum is σ = 100203440322. Its totient is φ = 100203440320.

The previous prime is 100203440299. The next prime is 100203440347. The reversal of 100203440321 is 123044302001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84867342400 + 15336097921 = 291320^2 + 123839^2 .

It is an emirp because it is prime and its reverse (123044302001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100203440321 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 = 100203440293 and 100203440302.

It is not a weakly prime, because it can be changed into another prime (100203442321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50101720160 + 50101720161.

It is an arithmetic number, because the mean of its divisors is an integer number (50101720161).

Almost surely, 2^100203440321 is an apocalyptic number.

It is an amenable number.

100203440321 is a deficient number, since it is larger than the sum of its proper divisors (1).

100203440321 is an equidigital number, since it uses as much as digits as its factorization.

100203440321 is an odious number, because the sum of its binary digits is odd.

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

Adding to 100203440321 its reverse (123044302001), we get a palindrome (223247742322).

The spelling of 100203440321 in words is "one hundred billion, two hundred three million, four hundred forty thousand, three hundred twenty-one".