100111221005 has 4 divisors (see below), whose sum is σ = 120133465212. Its totient is φ = 80088976800.

The previous prime is 100111220959. The next prime is 100111221019. The reversal of 100111221005 is 500122111001.

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 17738776969 + 82372444036 = 133187^2 + 287006^2 .

It is not a de Polignac number, because 100111221005 - 2⁸ = 100111220749 is a prime.

It is a super-2 number, since 2×100111221005² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10011122096 + ... + 10011122105.

It is an arithmetic number, because the mean of its divisors is an integer number (30033366303).

Almost surely, 2^100111221005 is an apocalyptic number.

It is an amenable number.

100111221005 is a deficient number, since it is larger than the sum of its proper divisors (20022244207).

100111221005 is an equidigital number, since it uses as much as digits as its factorization.

100111221005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20022244206.

The product of its (nonzero) digits is 20, while the sum is 14.

Adding to 100111221005 its reverse (500122111001), we get a palindrome (600233332006).

The spelling of 100111221005 in words is "one hundred billion, one hundred eleven million, two hundred twenty-one thousand, five".