21530534300505 has 16 divisors (see below), whose sum is σ = 38276505423360. Its totient is φ = 11482951626864.

The previous prime is 21530534300503. The next prime is 21530534300533. The reversal of 21530534300505 is 50500343503512.

21530534300505 is a `hidden beast` number, since 2 + 1 + 5 + 305 + 343 + 0 + 0 + 5 + 0 + 5 = 666.

It is not a de Polignac number, because 21530534300505 - 2¹ = 21530534300503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21530534300505.

It is not an unprimeable number, because it can be changed into a prime (21530534300501) 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, 79742719497 + ... + 79742719766.

It is an arithmetic number, because the mean of its divisors is an integer number (2392281588960).

Almost surely, 2^{21530534300505} is an apocalyptic number.

It is an amenable number.

21530534300505 is a deficient number, since it is larger than the sum of its proper divisors (16745971122855).

21530534300505 is a wasteful number, since it uses less digits than its factorization.

21530534300505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159485439277 (or 159485439271 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 36.

The spelling of 21530534300505 in words is "twenty-one trillion, five hundred thirty billion, five hundred thirty-four million, three hundred thousand, five hundred five".