21642316536 has 16 divisors (see below), whose sum is σ = 54105791400. Its totient is φ = 7214105504.

The previous prime is 21642316523. The next prime is 21642316537. The reversal of 21642316536 is 63561324612.

It is a junction number, because it is equal to n+sod(n) for n = 21642316494 and 21642316503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21642316537) 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 3 ways as a sum of consecutive naturals, for example, 450881571 + ... + 450881618.

Almost surely, 2^21642316536 is an apocalyptic number.

It is an amenable number.

21642316536 is an abundant number, since it is smaller than the sum of its proper divisors (32463474864).

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

21642316536 is a wasteful number, since it uses less digits than its factorization.

21642316536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901763198 (or 901763194 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The spelling of 21642316536 in words is "twenty-one billion, six hundred forty-two million, three hundred sixteen thousand, five hundred thirty-six".