2021118831 has 16 divisors (see below), whose sum is σ = 3170383200. Its totient is φ = 1268152704.

The previous prime is 2021118823. The next prime is 2021118833. The reversal of 2021118831 is 1388111202.

It is not a de Polignac number, because 2021118831 - 2³ = 2021118823 is a prime.

It is a super-2 number, since 2×2021118831² = 8169842658045613122, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 2021118795 and 2021118804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021118833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2201196 + ... + 2202113.

It is an arithmetic number, because the mean of its divisors is an integer number (198148950).

Almost surely, 2^2021118831 is an apocalyptic number.

2021118831 is a deficient number, since it is larger than the sum of its proper divisors (1149264369).

2021118831 is a wasteful number, since it uses less digits than its factorization.

2021118831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403335 (or 4403329 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 2021118831 is about 44956.8552169744. The cubic root of 2021118831 is about 1264.3402082474.

The spelling of 2021118831 in words is "two billion, twenty-one million, one hundred eighteen thousand, eight hundred thirty-one".