99587021 has 2 divisors, whose sum is σ = 99587022. Its totient is φ = 99587020.

The previous prime is 99587009. The next prime is 99587023. The reversal of 99587021 is 12078599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74476900 + 25110121 = 8630^2 + 5011^2 .

It is a cyclic number.

It is not a de Polignac number, because 99587021 - 2¹⁴ = 99570637 is a prime.

Together with 99587023, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99587021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99587023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49793510 + 49793511.

It is an arithmetic number, because the mean of its divisors is an integer number (49793511).

Almost surely, 2^99587021 is an apocalyptic number.

It is an amenable number.

99587021 is a deficient number, since it is larger than the sum of its proper divisors (1).

99587021 is an equidigital number, since it uses as much as digits as its factorization.

99587021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 99587021 is about 9979.3296869078. The cubic root of 99587021 is about 463.5190421764.

The spelling of 99587021 in words is "ninety-nine million, five hundred eighty-seven thousand, twenty-one".