21000101112009 has 8 divisors (see below), whose sum is σ = 31111260906720. Its totient is φ = 14000067407988.

The previous prime is 21000101111989. The next prime is 21000101112031. The reversal of 21000101112009 is 90021110100012.

It is a happy number.

It is not a de Polignac number, because 21000101112009 - 2¹¹ = 21000101109961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000101111982 and 21000101112000.

It is not an unprimeable number, because it can be changed into a prime (21000101112509) 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, 388890761307 + ... + 388890761360.

It is an arithmetic number, because the mean of its divisors is an integer number (3888907613340).

Almost surely, 2^{21000101112009} is an apocalyptic number.

It is an amenable number.

21000101112009 is a deficient number, since it is larger than the sum of its proper divisors (10111159794711).

21000101112009 is an equidigital number, since it uses as much as digits as its factorization.

21000101112009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777781522676 (or 777781522670 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 21000101112009 in words is "twenty-one trillion, one hundred one million, one hundred twelve thousand, nine".