2021566487 has 2 divisors, whose sum is σ = 2021566488. Its totient is φ = 2021566486.

The previous prime is 2021566453. The next prime is 2021566489. The reversal of 2021566487 is 7846651202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021566487 - 2⁸ = 2021566231 is a prime.

It is a super-2 number, since 2×2021566487² = 8173462122723042338, which contains 22 as substring.

Together with 2021566489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021566489) 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 as a sum of consecutive naturals, namely, 1010783243 + 1010783244.

It is an arithmetic number, because the mean of its divisors is an integer number (1010783244).

Almost surely, 2^2021566487 is an apocalyptic number.

2021566487 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021566487 is an equidigital number, since it uses as much as digits as its factorization.

2021566487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 2021566487 is about 44961.8336703476. The cubic root of 2021566487 is about 1264.4335472585.

The spelling of 2021566487 in words is "two billion, twenty-one million, five hundred sixty-six thousand, four hundred eighty-seven".