2871191021 has 4 divisors (see below), whose sum is σ = 2871300444. Its totient is φ = 2871081600.

The previous prime is 2871190963. The next prime is 2871191041. The reversal of 2871191021 is 1201911782.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2725988521 + 145202500 = 52211^2 + 12050^2 .

It is a cyclic number.

It is not a de Polignac number, because 2871191021 - 2²⁶ = 2804082157 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 (2871191041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10781 + ... + 76541.

It is an arithmetic number, because the mean of its divisors is an integer number (717825111).

Almost surely, 2^2871191021 is an apocalyptic number.

It is an amenable number.

2871191021 is a deficient number, since it is larger than the sum of its proper divisors (109423).

2871191021 is an equidigital number, since it uses as much as digits as its factorization.

2871191021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109422.

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

The square root of 2871191021 is about 53583.4957892820. The cubic root of 2871191021 is about 1421.3052570640.

The spelling of 2871191021 in words is "two billion, eight hundred seventy-one million, one hundred ninety-one thousand, twenty-one".