21636963760 has 40 divisors (see below), whose sum is σ = 50340880656. Its totient is φ = 8648774400.

The previous prime is 21636963721. The next prime is 21636963769. The reversal of 21636963760 is 6736963612.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21636963769) 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 7 ways as a sum of consecutive naturals, for example, 22882 + ... + 209278.

Almost surely, 2^21636963760 is an apocalyptic number.

21636963760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21636963760 is an abundant number, since it is smaller than the sum of its proper divisors (28703916896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21636963760 is a wasteful number, since it uses less digits than its factorization.

21636963760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187861 (or 187855 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 49.

The spelling of 21636963760 in words is "twenty-one billion, six hundred thirty-six million, nine hundred sixty-three thousand, seven hundred sixty".