21116400163556 has 6 divisors (see below), whose sum is σ = 36953700286230. Its totient is φ = 10558200081776.

The previous prime is 21116400163541. The next prime is 21116400163577. The reversal of 21116400163556 is 65536100461112.

It can be written as a sum of positive squares in only one way, i.e., 11395823092900 + 9720577070656 = 3375770^2 + 3117784^2 .

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 as a sum of consecutive naturals, namely, 2639550020441 + ... + 2639550020448.

It is an arithmetic number, because the mean of its divisors is an integer number (6158950047705).

Almost surely, 2^{21116400163556} is an apocalyptic number.

It is an amenable number.

21116400163556 is a deficient number, since it is larger than the sum of its proper divisors (15837300122674).

21116400163556 is a wasteful number, since it uses less digits than its factorization.

21116400163556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5279100040893 (or 5279100040891 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 21116400163556 in words is "twenty-one trillion, one hundred sixteen billion, four hundred million, one hundred sixty-three thousand, five hundred fifty-six".