21553105016 has 32 divisors (see below), whose sum is σ = 40807981440. Its totient is φ = 10671067488.

The previous prime is 21553104977. The next prime is 21553105039. The reversal of 21553105016 is 61050135512.

It is a self number, because there is not a number n which added to its sum of digits gives 21553105016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2634965 + ... + 2643131.

It is an arithmetic number, because the mean of its divisors is an integer number (1275249420).

Almost surely, 2^21553105016 is an apocalyptic number.

It is an amenable number.

21553105016 is a deficient number, since it is larger than the sum of its proper divisors (19254876424).

21553105016 is a wasteful number, since it uses less digits than its factorization.

21553105016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11363 (or 11359 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 21553105016 in words is "twenty-one billion, five hundred fifty-three million, one hundred five thousand, sixteen".