8580500021 has 2 divisors, whose sum is σ = 8580500022. Its totient is φ = 8580500020.

The previous prime is 8580500017. The next prime is 8580500029. The reversal of 8580500021 is 1200050858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5371277521 + 3209222500 = 73289^2 + 56650^2 .

It is a cyclic number.

It is not a de Polignac number, because 8580500021 - 2² = 8580500017 is a prime.

It is a super-2 number, since 2×8580500021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8580500029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4290250010 + 4290250011.

It is an arithmetic number, because the mean of its divisors is an integer number (4290250011).

Almost surely, 2^8580500021 is an apocalyptic number.

It is an amenable number.

8580500021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8580500021 is an equidigital number, since it uses as much as digits as its factorization.

8580500021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 8580500021 is about 92630.9884487907. The cubic root of 8580500021 is about 2047.2499329888.

Adding to 8580500021 its reverse (1200050858), we get a palindrome (9780550879).

The spelling of 8580500021 in words is "eight billion, five hundred eighty million, five hundred thousand, twenty-one".