21586700587 has 4 divisors (see below), whose sum is σ = 21908890216. Its totient is φ = 21264510960.

The previous prime is 21586700573. The next prime is 21586700591. The reversal of 21586700587 is 78500768512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21586700587 - 2⁷ = 21586700459 is a prime.

It is a super-2 number, since 2×21586700587² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21586700587.

It is not an unprimeable number, because it can be changed into a prime (21586700287) 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 in 3 ways as a sum of consecutive naturals, for example, 161094714 + ... + 161094847.

It is an arithmetic number, because the mean of its divisors is an integer number (5477222554).

Almost surely, 2^21586700587 is an apocalyptic number.

21586700587 is a deficient number, since it is larger than the sum of its proper divisors (322189629).

21586700587 is an equidigital number, since it uses as much as digits as its factorization.

21586700587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322189628.

The product of its (nonzero) digits is 940800, while the sum is 49.

The spelling of 21586700587 in words is "twenty-one billion, five hundred eighty-six million, seven hundred thousand, five hundred eighty-seven".