21100110009 has 8 divisors (see below), whose sum is σ = 30691069152. Its totient is φ = 12787945440.

The previous prime is 21100109959. The next prime is 21100110013. The reversal of 21100110009 is 90001100112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21100110009 - 2⁸ = 21100109753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21100110009.

It is not an unprimeable number, because it can be changed into a prime (21100110049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319698604 + ... + 319698669.

It is an arithmetic number, because the mean of its divisors is an integer number (3836383644).

Almost surely, 2^21100110009 is an apocalyptic number.

It is an amenable number.

21100110009 is a deficient number, since it is larger than the sum of its proper divisors (9590959143).

21100110009 is a wasteful number, since it uses less digits than its factorization.

21100110009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639397287.

The product of its (nonzero) digits is 18, while the sum is 15.

It can be divided in two parts, 2 and 1100110009, that added together give a palindrome (1100110011).

The spelling of 21100110009 in words is "twenty-one billion, one hundred million, one hundred ten thousand, nine".