100003120321 has 4 divisors (see below), whose sum is σ = 107695668052. Its totient is φ = 92310572592.

The previous prime is 100003120309. The next prime is 100003120333. The reversal of 100003120321 is 123021300001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123021300001 = 1619 ⋅75985979.

It is an interprime number because it is at equal distance from previous prime (100003120309) and next prime (100003120333).

It can be written as a sum of positive squares in 2 ways, for example, as 17771822721 + 82231297600 = 133311^2 + 286760^2 .

It is a cyclic number.

It is not a de Polignac number, because 100003120321 - 2⁵ = 100003120289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 7692547717 = 100003120321 / (1 + 0 + 0 + 0 + 0 + 3 + 1 + 2 + 0 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100003120361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3846273846 + ... + 3846273871.

It is an arithmetic number, because the mean of its divisors is an integer number (26923917013).

Almost surely, 2^100003120321 is an apocalyptic number.

It is an amenable number.

100003120321 is a deficient number, since it is larger than the sum of its proper divisors (7692547731).

100003120321 is an equidigital number, since it uses as much as digits as its factorization.

100003120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7692547730.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 100003120321 its reverse (123021300001), we get a palindrome (223024420322).

The spelling of 100003120321 in words is "one hundred billion, three million, one hundred twenty thousand, three hundred twenty-one".