2021716087 has 4 divisors (see below), whose sum is σ = 2022179040. Its totient is φ = 2021253136.

The previous prime is 2021716051. The next prime is 2021716129. The reversal of 2021716087 is 7806171202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7806171202 = 2 ⋅3903085601.

It is a cyclic number.

It is not a de Polignac number, because 2021716087 - 2²⁷ = 1887498359 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 (2021716387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224863 + ... + 233680.

It is an arithmetic number, because the mean of its divisors is an integer number (505544760).

Almost surely, 2^2021716087 is an apocalyptic number.

2021716087 is a deficient number, since it is larger than the sum of its proper divisors (462953).

2021716087 is an equidigital number, since it uses as much as digits as its factorization.

2021716087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462952.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 2021716087 is about 44963.4972727878. The cubic root of 2021716087 is about 1264.4647367006.

Adding to 2021716087 its reverse (7806171202), we get a palindrome (9827887289).

The spelling of 2021716087 in words is "two billion, twenty-one million, seven hundred sixteen thousand, eighty-seven".