2021783 has 2 divisors, whose sum is σ = 2021784. Its totient is φ = 2021782.

The previous prime is 2021779. The next prime is 2021801. The reversal of 2021783 is 3871202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021783 - 2² = 2021779 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010891 + 1010892.

It is an arithmetic number, because the mean of its divisors is an integer number (1010892).

2^2021783 is an apocalyptic number.

2021783 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021783 is an equidigital number, since it uses as much as digits as its factorization.

2021783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2021783 is about 1421.8941592116. The cubic root of 2021783 is about 126.4478686598.

Adding to 2021783 its reverse (3871202), we get a palindrome (5892985).

The spelling of 2021783 in words is "two million, twenty-one thousand, seven hundred eighty-three".