20111222209 has 16 divisors (see below), whose sum is σ = 22421044800. Its totient is φ = 17911285056.

The previous prime is 20111222203. The next prime is 20111222233. The reversal of 20111222209 is 90222211102.

It is a cyclic number.

It is not a de Polignac number, because 20111222209 - 2⁵ = 20111222177 is a prime.

It is a super-2 number, since 2×20111222209² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111222209.

It is not an unprimeable number, because it can be changed into a prime (20111222203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531762 + ... + 568324.

It is an arithmetic number, because the mean of its divisors is an integer number (1401315300).

Almost surely, 2^20111222209 is an apocalyptic number.

20111222209 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20111222209 is a deficient number, since it is larger than the sum of its proper divisors (2309822591).

20111222209 is a wasteful number, since it uses less digits than its factorization.

20111222209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38064.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 20111222209 in words is "twenty billion, one hundred eleven million, two hundred twenty-two thousand, two hundred nine".