2021772143 has 4 divisors (see below), whose sum is σ = 2022844320. Its totient is φ = 2020699968.

The previous prime is 2021772131. The next prime is 2021772161. The reversal of 2021772143 is 3412771202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021772143 - 2⁸ = 2021771887 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 (2021772343) 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 3 ways as a sum of consecutive naturals, for example, 533255 + ... + 537032.

It is an arithmetic number, because the mean of its divisors is an integer number (505711080).

Almost surely, 2^2021772143 is an apocalyptic number.

2021772143 is a deficient number, since it is larger than the sum of its proper divisors (1072177).

2021772143 is a wasteful number, since it uses less digits than its factorization.

2021772143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072176.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 2021772143 is about 44964.1206185554. The cubic root of 2021772143 is about 1264.4764231717.

The spelling of 2021772143 in words is "two billion, twenty-one million, seven hundred seventy-two thousand, one hundred forty-three".