21308763017 has 8 divisors (see below), whose sum is σ = 22432394400. Its totient is φ = 20185343424.

The previous prime is 21308762947. The next prime is 21308763059. The reversal of 21308763017 is 71036780312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21308763017 - 2¹⁰ = 21308761993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21308760017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179873 + ... + 273809.

It is an arithmetic number, because the mean of its divisors is an integer number (2804049300).

Almost surely, 2^21308763017 is an apocalyptic number.

It is an amenable number.

21308763017 is a deficient number, since it is larger than the sum of its proper divisors (1123631383).

21308763017 is a wasteful number, since it uses less digits than its factorization.

21308763017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105895.

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 21308763017 in words is "twenty-one billion, three hundred eight million, seven hundred sixty-three thousand, seventeen".