2021121208 has 16 divisors (see below), whose sum is σ = 3826396080. Its totient is φ = 1000748928.

The previous prime is 2021121191. The next prime is 2021121209. The reversal of 2021121208 is 8021211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021121209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1225585 + ... + 1227232.

It is an arithmetic number, because the mean of its divisors is an integer number (239149755).

Almost surely, 2^2021121208 is an apocalyptic number.

It is an amenable number.

2021121208 is a deficient number, since it is larger than the sum of its proper divisors (1805274872).

2021121208 is a wasteful number, since it uses less digits than its factorization.

2021121208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452926 (or 2452922 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 2021121208 is about 44956.8816534243. The cubic root of 2021121208 is about 1264.3407039029.

The spelling of 2021121208 in words is "two billion, twenty-one million, one hundred twenty-one thousand, two hundred eight".