22011020209 has 4 divisors (see below), whose sum is σ = 22027052916. Its totient is φ = 21994987504.

The previous prime is 22011020189. The next prime is 22011020221. The reversal of 22011020209 is 90202011022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90202011022 = 2 ⋅45101005511.

It can be written as a sum of positive squares in 2 ways, for example, as 13201320609 + 8809699600 = 114897^2 + 93860^2 .

It is a cyclic number.

It is not a de Polignac number, because 22011020209 - 2⁷ = 22011020081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22011021209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8014294 + ... + 8017039.

It is an arithmetic number, because the mean of its divisors is an integer number (5506763229).

Almost surely, 2^22011020209 is an apocalyptic number.

It is an amenable number.

22011020209 is a deficient number, since it is larger than the sum of its proper divisors (16032707).

22011020209 is a wasteful number, since it uses less digits than its factorization.

22011020209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16032706.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 22011020209 in words is "twenty-two billion, eleven million, twenty thousand, two hundred nine".