21170624587 has 24 divisors (see below), whose sum is σ = 25180338240. Its totient is φ = 17739469440.

The previous prime is 21170624549. The next prime is 21170624593. The reversal of 21170624587 is 78542607112.

It is not a de Polignac number, because 21170624587 - 2²³ = 21162235979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21170625587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2162239 + ... + 2172007.

It is an arithmetic number, because the mean of its divisors is an integer number (1049180760).

Almost surely, 2^21170624587 is an apocalyptic number.

21170624587 is a deficient number, since it is larger than the sum of its proper divisors (4009713653).

21170624587 is an equidigital number, since it uses as much as digits as its factorization.

21170624587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10771 (or 10764 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 21170624587 in words is "twenty-one billion, one hundred seventy million, six hundred twenty-four thousand, five hundred eighty-seven".