21565034535 has 16 divisors (see below), whose sum is σ = 37640787840. Its totient is φ = 10455774240.

The previous prime is 21565034489. The next prime is 21565034537. The reversal of 21565034535 is 53543056512.

It is not a de Polignac number, because 21565034535 - 2¹¹ = 21565032487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21565034493 and 21565034502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21565034537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65348425 + ... + 65348754.

It is an arithmetic number, because the mean of its divisors is an integer number (2352549240).

Almost surely, 2^21565034535 is an apocalyptic number.

21565034535 is a deficient number, since it is larger than the sum of its proper divisors (16075753305).

21565034535 is a wasteful number, since it uses less digits than its factorization.

21565034535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130697198.

The product of its (nonzero) digits is 270000, while the sum is 39.

The spelling of 21565034535 in words is "twenty-one billion, five hundred sixty-five million, thirty-four thousand, five hundred thirty-five".