21071405536305 has 16 divisors (see below), whose sum is σ = 33727053421440. Its totient is φ = 11233814764928.

The previous prime is 21071405536283. The next prime is 21071405536381. The reversal of 21071405536305 is 50363550417012.

It is a cyclic number.

It is not a de Polignac number, because 21071405536305 - 2⁶ = 21071405536241 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266720925 + ... + 266799914.

It is an arithmetic number, because the mean of its divisors is an integer number (2107940838840).

Almost surely, 2^{21071405536305} is an apocalyptic number.

It is an amenable number.

21071405536305 is a deficient number, since it is larger than the sum of its proper divisors (12655647885135).

21071405536305 is a wasteful number, since it uses less digits than its factorization.

21071405536305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533523480.

The product of its (nonzero) digits is 378000, while the sum is 42.

The spelling of 21071405536305 in words is "twenty-one trillion, seventy-one billion, four hundred five million, five hundred thirty-six thousand, three hundred five".