21001108004 has 12 divisors (see below), whose sum is σ = 36772358028. Its totient is φ = 10494720000.

The previous prime is 21001107989. The next prime is 21001108021. The reversal of 21001108004 is 40080110012.

It can be written as a sum of positive squares in 2 ways, for example, as 7849605604 + 13151502400 = 88598^2 + 114680^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1450397 + ... + 1464804.

It is an arithmetic number, because the mean of its divisors is an integer number (3064363169).

Almost surely, 2^21001108004 is an apocalyptic number.

It is an amenable number.

21001108004 is a deficient number, since it is larger than the sum of its proper divisors (15771250024).

21001108004 is a wasteful number, since it uses less digits than its factorization.

21001108004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2917006 (or 2917004 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21001108004 its reverse (40080110012), we get a palindrome (61081218016).

The spelling of 21001108004 in words is "twenty-one billion, one million, one hundred eight thousand, four".