100021321003 has 4 divisors (see below), whose sum is σ = 100026604008. Its totient is φ = 100016038000.

The previous prime is 100021320991. The next prime is 100021321051. The reversal of 100021321003 is 300123120001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100021321003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100021321073) 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, 2613001 + ... + 2651002.

It is an arithmetic number, because the mean of its divisors is an integer number (25006651002).

Almost surely, 2^100021321003 is an apocalyptic number.

100021321003 is a deficient number, since it is larger than the sum of its proper divisors (5283005).

100021321003 is an equidigital number, since it uses as much as digits as its factorization.

100021321003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5283004.

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

Adding to 100021321003 its reverse (300123120001), we get a palindrome (400144441004).

The spelling of 100021321003 in words is "one hundred billion, twenty-one million, three hundred twenty-one thousand, three".