100003121321 has 4 divisors (see below), whose sum is σ = 100126430544. Its totient is φ = 99879812100.

The previous prime is 100003121243. The next prime is 100003121347. The reversal of 100003121321 is 123121300001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100003121321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100003121296 and 100003121305.

It is not an unprimeable number, because it can be changed into a prime (100003121821) 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, 61653395 + ... + 61655016.

It is an arithmetic number, because the mean of its divisors is an integer number (25031607636).

Almost surely, 2^100003121321 is an apocalyptic number.

It is an amenable number.

100003121321 is a deficient number, since it is larger than the sum of its proper divisors (123309223).

100003121321 is an equidigital number, since it uses as much as digits as its factorization.

100003121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123309222.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 100003121321 its reverse (123121300001), we get a palindrome (223124421322).

The spelling of 100003121321 in words is "one hundred billion, three million, one hundred twenty-one thousand, three hundred twenty-one".