2121121208 has 8 divisors (see below), whose sum is σ = 3977102280. Its totient is φ = 1060560600.

The previous prime is 2121121207. The next prime is 2121121217. The reversal of 2121121208 is 8021211212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2121121208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121121201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132570068 + ... + 132570083.

It is an arithmetic number, because the mean of its divisors is an integer number (497137785).

Almost surely, 2^2121121208 is an apocalyptic number.

It is an amenable number.

2121121208 is a deficient number, since it is larger than the sum of its proper divisors (1855981072).

2121121208 is a wasteful number, since it uses less digits than its factorization.

2121121208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265140157 (or 265140153 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 2121121208 is about 46055.6316643253. The cubic root of 2121121208 is about 1284.8580862420.

The spelling of 2121121208 in words is "two billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred eight".