2021115871 has 2 divisors, whose sum is σ = 2021115872. Its totient is φ = 2021115870.

The previous prime is 2021115857. The next prime is 2021115913. The reversal of 2021115871 is 1785111202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021115871 - 2⁹ = 2021115359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021115841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010557935 + 1010557936.

It is an arithmetic number, because the mean of its divisors is an integer number (1010557936).

Almost surely, 2^2021115871 is an apocalyptic number.

2021115871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021115871 is an equidigital number, since it uses as much as digits as its factorization.

2021115871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 28.

The square root of 2021115871 is about 44956.8222965102. The cubic root of 2021115871 is about 1264.3395910235.

The spelling of 2021115871 in words is "two billion, twenty-one million, one hundred fifteen thousand, eight hundred seventy-one".