21836716838550 has 72 divisors (see below), whose sum is σ = 59272803886296. Its totient is φ = 5763092267520.

The previous prime is 21836716838473. The next prime is 21836716838593. The reversal of 21836716838550 is 5583861763812.

21836716838550 is a `hidden beast` number, since 2 + 1 + 8 + 3 + 6 + 71 + 6 + 8 + 3 + 8 + 550 = 666.

It is a super-2 number, since 2×21836716838550² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 250090564 + ... + 250177863.

Almost surely, 2^{21836716838550} is an apocalyptic number.

21836716838550 is an abundant number, since it is smaller than the sum of its proper divisors (37436087047746).

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

21836716838550 is a wasteful number, since it uses less digits than its factorization.

21836716838550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500268542 (or 500268534 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 63.

The spelling of 21836716838550 in words is "twenty-one trillion, eight hundred thirty-six billion, seven hundred sixteen million, eight hundred thirty-eight thousand, five hundred fifty".