100403321 has 4 divisors (see below), whose sum is σ = 100557732. Its totient is φ = 100248912.

The previous prime is 100403299. The next prime is 100403333. The reversal of 100403321 is 123304001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123304001 = 251 ⋅491251.

It can be written as a sum of positive squares in 2 ways, for example, as 57684025 + 42719296 = 7595^2 + 6536^2 .

It is a cyclic number.

It is not a de Polignac number, because 100403321 - 2¹⁰ = 100402297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100403296 and 100403305.

It is not an unprimeable number, because it can be changed into a prime (100403341) 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, 76226 + ... + 77531.

It is an arithmetic number, because the mean of its divisors is an integer number (25139433).

Almost surely, 2^100403321 is an apocalyptic number.

It is an amenable number.

100403321 is a deficient number, since it is larger than the sum of its proper divisors (154411).

100403321 is an equidigital number, since it uses as much as digits as its factorization.

100403321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154410.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 100403321 is about 10020.1457574229. The cubic root of 100403321 is about 464.7820630558.

Adding to 100403321 its reverse (123304001), we get a palindrome (223707322).

The spelling of 100403321 in words is "one hundred million, four hundred three thousand, three hundred twenty-one".