21060816585 has 16 divisors (see below), whose sum is σ = 34123856640. Its totient is φ = 11090252160.

The previous prime is 21060816563. The next prime is 21060816593. The reversal of 21060816585 is 58561806012.

It is not a de Polignac number, because 21060816585 - 2¹² = 21060812489 is a prime.

It is a super-2 number, since 2×21060816585² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8885236 + ... + 8887605.

It is an arithmetic number, because the mean of its divisors is an integer number (2132741040).

Almost surely, 2^21060816585 is an apocalyptic number.

It is an amenable number.

21060816585 is a deficient number, since it is larger than the sum of its proper divisors (13063040055).

21060816585 is a wasteful number, since it uses less digits than its factorization.

21060816585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17772928.

The product of its (nonzero) digits is 115200, while the sum is 42.

The spelling of 21060816585 in words is "twenty-one billion, sixty million, eight hundred sixteen thousand, five hundred eighty-five".