2021567 has 2 divisors, whose sum is σ = 2021568. Its totient is φ = 2021566.

The previous prime is 2021563. The next prime is 2021573. The reversal of 2021567 is 7651202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021567 - 2² = 2021563 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010783 + 1010784.

It is an arithmetic number, because the mean of its divisors is an integer number (1010784).

2^2021567 is an apocalyptic number.

2021567 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021567 is an equidigital number, since it uses as much as digits as its factorization.

2021567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 2021567 is about 1421.8182021623. The cubic root of 2021567 is about 126.4433654214.

Adding to 2021567 its reverse (7651202), we get a palindrome (9672769).

The spelling of 2021567 in words is "two million, twenty-one thousand, five hundred sixty-seven".