100331321 has 4 divisors (see below), whose sum is σ = 100970532. Its totient is φ = 99692112.

The previous prime is 100331317. The next prime is 100331327. The reversal of 100331321 is 123133001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123133001 = 9161 ⋅13441.

It can be written as a sum of positive squares in 2 ways, for example, as 70476025 + 29855296 = 8395^2 + 5464^2 .

It is a cyclic number.

It is not a de Polignac number, because 100331321 - 2² = 100331317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100331296 and 100331305.

It is not an unprimeable number, because it can be changed into a prime (100331327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319370 + ... + 319683.

It is an arithmetic number, because the mean of its divisors is an integer number (25242633).

Almost surely, 2^100331321 is an apocalyptic number.

It is an amenable number.

100331321 is a deficient number, since it is larger than the sum of its proper divisors (639211).

100331321 is an equidigital number, since it uses as much as digits as its factorization.

100331321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639210.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 100331321 is about 10016.5523509838. The cubic root of 100331321 is about 464.6709368813.

Adding to 100331321 its reverse (123133001), we get a palindrome (223464322).

The spelling of 100331321 in words is "one hundred million, three hundred thirty-one thousand, three hundred twenty-one".