20111121208 has 8 divisors (see below), whose sum is σ = 37708352280. Its totient is φ = 10055560600.

The previous prime is 20111121187. The next prime is 20111121209. The reversal of 20111121208 is 80212111102.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111121209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1256945068 + ... + 1256945083.

It is an arithmetic number, because the mean of its divisors is an integer number (4713544035).

Almost surely, 2^20111121208 is an apocalyptic number.

It is an amenable number.

20111121208 is a deficient number, since it is larger than the sum of its proper divisors (17597231072).

20111121208 is a wasteful number, since it uses less digits than its factorization.

20111121208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513890157 (or 2513890153 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

The spelling of 20111121208 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, two hundred eight".