2021291271 has 24 divisors (see below), whose sum is σ = 3023991360. Its totient is φ = 1299480000.

The previous prime is 2021291249. The next prime is 2021291297. The reversal of 2021291271 is 1721921202.

It is not a de Polignac number, because 2021291271 - 2¹¹ = 2021289223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021291201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 233521 + ... + 242021.

It is an arithmetic number, because the mean of its divisors is an integer number (125999640).

Almost surely, 2^2021291271 is an apocalyptic number.

2021291271 is a deficient number, since it is larger than the sum of its proper divisors (1002700089).

2021291271 is a wasteful number, since it uses less digits than its factorization.

2021291271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9447 (or 9444 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 2021291271 is about 44958.7730148411. The cubic root of 2021291271 is about 1264.3761646728.

The spelling of 2021291271 in words is "two billion, twenty-one million, two hundred ninety-one thousand, two hundred seventy-one".