2021118791 has 8 divisors (see below), whose sum is σ = 2039975280. Its totient is φ = 2002279552.

The previous prime is 2021118761. The next prime is 2021118817. The reversal of 2021118791 is 1978111202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2021118791 - 2⁶ = 2021118727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021118751) 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 7 ways as a sum of consecutive naturals, for example, 424661 + ... + 429393.

It is an arithmetic number, because the mean of its divisors is an integer number (254996910).

Almost surely, 2^2021118791 is an apocalyptic number.

2021118791 is a deficient number, since it is larger than the sum of its proper divisors (18856489).

2021118791 is a wasteful number, since it uses less digits than its factorization.

2021118791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8625.

The product of its (nonzero) digits is 2016, while the sum is 32.

The square root of 2021118791 is about 44956.8547721034. The cubic root of 2021118791 is about 1264.3401999066.

Adding to 2021118791 its reverse (1978111202), we get a palindrome (3999229993).

The spelling of 2021118791 in words is "two billion, twenty-one million, one hundred eighteen thousand, seven hundred ninety-one".