100021112005 has 4 divisors (see below), whose sum is σ = 120025334412. Its totient is φ = 80016889600.

The previous prime is 100021112003. The next prime is 100021112033. The reversal of 100021112005 is 500211120001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41989747396 + 58031364609 = 204914^2 + 240897^2 .

It is not a de Polignac number, because 100021112005 - 2¹ = 100021112003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021112003) 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, 10002111196 + ... + 10002111205.

It is an arithmetic number, because the mean of its divisors is an integer number (30006333603).

Almost surely, 2^100021112005 is an apocalyptic number.

It is an amenable number.

100021112005 is a deficient number, since it is larger than the sum of its proper divisors (20004222407).

100021112005 is an equidigital number, since it uses as much as digits as its factorization.

100021112005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20004222406.

The product of its (nonzero) digits is 20, while the sum is 13.

Adding to 100021112005 its reverse (500211120001), we get a palindrome (600232232006).

The spelling of 100021112005 in words is "one hundred billion, twenty-one million, one hundred twelve thousand, five".