21548240017 has 4 divisors (see below), whose sum is σ = 21644869120. Its totient is φ = 21451610916.

The previous prime is 21548240009. The next prime is 21548240029. The reversal of 21548240017 is 71004284512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21548240017 - 2³ = 21548240009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21548240117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48314217 + ... + 48314662.

It is an arithmetic number, because the mean of its divisors is an integer number (5411217280).

Almost surely, 2^21548240017 is an apocalyptic number.

It is an amenable number.

21548240017 is a deficient number, since it is larger than the sum of its proper divisors (96629103).

21548240017 is an equidigital number, since it uses as much as digits as its factorization.

21548240017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96629102.

The product of its (nonzero) digits is 17920, while the sum is 34.

The spelling of 21548240017 in words is "twenty-one billion, five hundred forty-eight million, two hundred forty thousand, seventeen".