21650555008 has 16 divisors (see below), whose sum is σ = 43131965310. Its totient is φ = 10825277440.

The previous prime is 21650554999. The next prime is 21650555053. The reversal of 21650555008 is 80055505612.

It can be written as a sum of positive squares in only one way, i.e., 18324495424 + 3326059584 = 135368^2 + 57672^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84572353 + ... + 84572608.

Almost surely, 2^21650555008 is an apocalyptic number.

It is an amenable number.

21650555008 is a deficient number, since it is larger than the sum of its proper divisors (21481410302).

21650555008 is an equidigital number, since it uses as much as digits as its factorization.

21650555008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169144975 (or 169144963 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 37.

The spelling of 21650555008 in words is "twenty-one billion, six hundred fifty million, five hundred fifty-five thousand, eight".