21513541305535 has 32 divisors (see below), whose sum is σ = 27047378534400. Its totient is φ = 16405276567680.

The previous prime is 21513541305439. The next prime is 21513541305551. The reversal of 21513541305535 is 53550314531512.

It is a de Polignac number, because none of the positive numbers 2^k-21513541305535 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21513541305491 and 21513541305500.

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 31 ways as a sum of consecutive naturals, for example, 114077770 + ... + 114266200.

It is an arithmetic number, because the mean of its divisors is an integer number (845230579200).

Almost surely, 2^{21513541305535} is an apocalyptic number.

21513541305535 is a deficient number, since it is larger than the sum of its proper divisors (5533837228865).

21513541305535 is a wasteful number, since it uses less digits than its factorization.

21513541305535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198511.

The product of its (nonzero) digits is 675000, while the sum is 43.

The spelling of 21513541305535 in words is "twenty-one trillion, five hundred thirteen billion, five hundred forty-one million, three hundred five thousand, five hundred thirty-five".