100003121305 has 16 divisors (see below), whose sum is σ = 121696473600. Its totient is φ = 78876907200.

The previous prime is 100003121243. The next prime is 100003121347. The reversal of 100003121305 is 503121300001.

It is not a de Polignac number, because 100003121305 - 2¹⁷ = 100002990233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96316 + ... + 457474.

It is an arithmetic number, because the mean of its divisors is an integer number (7606029600).

Almost surely, 2^100003121305 is an apocalyptic number.

It is an amenable number.

100003121305 is a deficient number, since it is larger than the sum of its proper divisors (21693352295).

100003121305 is an equidigital number, since it uses as much as digits as its factorization.

100003121305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361944.

The product of its (nonzero) digits is 90, while the sum is 16.

Adding to 100003121305 its reverse (503121300001), we get a palindrome (603124421306).

The spelling of 100003121305 in words is "one hundred billion, three million, one hundred twenty-one thousand, three hundred five".