2021563 has 2 divisors, whose sum is σ = 2021564. Its totient is φ = 2021562.

The previous prime is 2021549. The next prime is 2021567. The reversal of 2021563 is 3651202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021563 - 2¹³ = 2013371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021563.

It is not a weakly prime, because it can be changed into another prime (2021567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010781 + 1010782.

It is an arithmetic number, because the mean of its divisors is an integer number (1010782).

2^2021563 is an apocalyptic number.

2021563 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021563 is an equidigital number, since it uses as much as digits as its factorization.

2021563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 2021563 is about 1421.8167955120. The cubic root of 2021563 is about 126.4432820251.

Adding to 2021563 its reverse (3651202), we get a palindrome (5672765).

The spelling of 2021563 in words is "two million, twenty-one thousand, five hundred sixty-three".