2021801871 has 8 divisors (see below), whose sum is σ = 2695947184. Its totient is φ = 1347762240.

The previous prime is 2021801861. The next prime is 2021801879. The reversal of 2021801871 is 1781081202.

It is a happy number.

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

It is not a de Polignac number, because 2021801871 - 2⁶ = 2021801807 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 (2021801879) 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 7 ways as a sum of consecutive naturals, for example, 48891 + ... + 80211.

It is an arithmetic number, because the mean of its divisors is an integer number (336993398).

Almost surely, 2^2021801871 is an apocalyptic number.

2021801871 is a deficient number, since it is larger than the sum of its proper divisors (674145313).

2021801871 is a wasteful number, since it uses less digits than its factorization.

2021801871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52841.

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 2021801871 is about 44964.4511920250. The cubic root of 2021801871 is about 1264.4826207331.

The spelling of 2021801871 in words is "two billion, twenty-one million, eight hundred one thousand, eight hundred seventy-one".