20121211222209 has 12 divisors (see below), whose sum is σ = 30140415164496. Its totient is φ = 13414140814644.

The previous prime is 20121211222207. The next prime is 20121211222271. The reversal of 20121211222209 is 90222211212102.

20121211222209 is a `hidden beast` number, since 2 + 0 + 1 + 21 + 211 + 222 + 209 = 666.

It is not a de Polignac number, because 20121211222209 - 2¹ = 20121211222207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20121211222207) 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, 41401668939 + ... + 41401669424.

It is an arithmetic number, because the mean of its divisors is an integer number (2511701263708).

Almost surely, 2^{20121211222209} is an apocalyptic number.

It is an amenable number.

20121211222209 is a deficient number, since it is larger than the sum of its proper divisors (10019203942287).

20121211222209 is an frugal number, since it uses more digits than its factorization.

20121211222209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82803338378 (or 82803338366 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 20121211222209 in words is "twenty trillion, one hundred twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred nine".