21110002209 has 12 divisors (see below), whose sum is σ = 31817974656. Its totient is φ = 13461450552.

The previous prime is 21110002181. The next prime is 21110002211. The reversal of 21110002209 is 90220001112.

It is not a de Polignac number, because 21110002209 - 2¹² = 21109998113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21110002191 and 21110002200.

It is not an unprimeable number, because it can be changed into a prime (21110002279) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50990137 + ... + 50990550.

It is an arithmetic number, because the mean of its divisors is an integer number (2651497888).

Almost surely, 2^21110002209 is an apocalyptic number.

It is an amenable number.

21110002209 is a deficient number, since it is larger than the sum of its proper divisors (10707972447).

21110002209 is a wasteful number, since it uses less digits than its factorization.

21110002209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101980716 (or 101980713 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 21110002209 in words is "twenty-one billion, one hundred ten million, two thousand, two hundred nine".