21001112104 has 64 divisors (see below), whose sum is σ = 45277309440. Its totient is φ = 8945648640.

The previous prime is 21001112071. The next prime is 21001112117. The reversal of 21001112104 is 40121110012.

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, 8811697 + ... + 8814079.

It is an arithmetic number, because the mean of its divisors is an integer number (707457960).

Almost surely, 2^21001112104 is an apocalyptic number.

It is an amenable number.

21001112104 is an abundant number, since it is smaller than the sum of its proper divisors (24276197336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001112104 is a wasteful number, since it uses less digits than its factorization.

21001112104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3290 (or 3286 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001112104 its reverse (40121110012), we get a palindrome (61122222116).

The spelling of 21001112104 in words is "twenty-one billion, one million, one hundred twelve thousand, one hundred four".