21065353055 has 12 divisors (see below), whose sum is σ = 26852860200. Its totient is φ = 15860970624.

The previous prime is 21065353039. The next prime is 21065353061. The reversal of 21065353055 is 55035356012.

It is not a de Polignac number, because 21065353055 - 2⁴ = 21065353039 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 7287605 + ... + 7290494.

It is an arithmetic number, because the mean of its divisors is an integer number (2237738350).

Almost surely, 2^21065353055 is an apocalyptic number.

21065353055 is a deficient number, since it is larger than the sum of its proper divisors (5787507145).

21065353055 is a wasteful number, since it uses less digits than its factorization.

21065353055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14578138 (or 14578121 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 35.

The spelling of 21065353055 in words is "twenty-one billion, sixty-five million, three hundred fifty-three thousand, fifty-five".