21636587006 has 16 divisors (see below), whose sum is σ = 33552025584. Its totient is φ = 10457766144.

The previous prime is 21636586999. The next prime is 21636587033. The reversal of 21636587006 is 60078563612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1288505 + ... + 1305188.

It is an arithmetic number, because the mean of its divisors is an integer number (2097001599).

Almost surely, 2^21636587006 is an apocalyptic number.

21636587006 is a deficient number, since it is larger than the sum of its proper divisors (11915438578).

21636587006 is a wasteful number, since it uses less digits than its factorization.

21636587006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2593835.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 21636587006 in words is "twenty-one billion, six hundred thirty-six million, five hundred eighty-seven thousand, six".