21118524505 has 32 divisors (see below), whose sum is σ = 27664358400. Its totient is φ = 15382628352.

The previous prime is 21118524503. The next prime is 21118524547. The reversal of 21118524505 is 50542581112.

It is not a de Polignac number, because 21118524505 - 2¹ = 21118524503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21118524503) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 10356276 + ... + 10358314.

It is an arithmetic number, because the mean of its divisors is an integer number (864511200).

Almost surely, 2^21118524505 is an apocalyptic number.

It is an amenable number.

21118524505 is a deficient number, since it is larger than the sum of its proper divisors (6545833895).

21118524505 is a wasteful number, since it uses less digits than its factorization.

21118524505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4153.

The product of its (nonzero) digits is 16000, while the sum is 34.

The spelling of 21118524505 in words is "twenty-one billion, one hundred eighteen million, five hundred twenty-four thousand, five hundred five".