21636600016 has 10 divisors (see below), whose sum is σ = 41920912562. Its totient is φ = 10818300000.

The previous prime is 21636599987. The next prime is 21636600017. The reversal of 21636600016 is 61000663612.

It can be written as a sum of positive squares in only one way, i.e., 13179958416 + 8456641600 = 114804^2 + 91960^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21636600017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 676143735 + ... + 676143766.

Almost surely, 2^21636600016 is an apocalyptic number.

It is an amenable number.

21636600016 is a deficient number, since it is larger than the sum of its proper divisors (20284312546).

21636600016 is a wasteful number, since it uses less digits than its factorization.

21636600016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352287509 (or 1352287503 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 21636600016 in words is "twenty-one billion, six hundred thirty-six million, six hundred thousand, sixteen".