21649813006616 has 16 divisors (see below), whose sum is σ = 40797386322000. Its totient is φ = 10770509987424.

The previous prime is 21649813006597. The next prime is 21649813006631. The reversal of 21649813006616 is 61660031894612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6799562795 + ... + 6799565978.

It is an arithmetic number, because the mean of its divisors is an integer number (2549836645125).

Almost surely, 2^{21649813006616} is an apocalyptic number.

It is an amenable number.

21649813006616 is a deficient number, since it is larger than the sum of its proper divisors (19147573315384).

21649813006616 is a wasteful number, since it uses less digits than its factorization.

21649813006616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13599128978 (or 13599128974 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 21649813006616 in words is "twenty-one trillion, six hundred forty-nine billion, eight hundred thirteen million, six thousand, six hundred sixteen".