21517036341321 has 8 divisors (see below), whose sum is σ = 28716370863040. Its totient is φ = 14331196356912.

The previous prime is 21517036341319. The next prime is 21517036341379. The reversal of 21517036341321 is 12314363071512.

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

It is not a de Polignac number, because 21517036341321 - 2¹ = 21517036341319 is a prime.

It is a super-2 number, since 2×21517036341321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21517036341321.

It is not an unprimeable number, because it can be changed into a prime (21517036341721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3373630606 + ... + 3373636983.

It is an arithmetic number, because the mean of its divisors is an integer number (3589546357880).

Almost surely, 2^{21517036341321} is an apocalyptic number.

It is an amenable number.

21517036341321 is a deficient number, since it is larger than the sum of its proper divisors (7199334521719).

21517036341321 is a wasteful number, since it uses less digits than its factorization.

21517036341321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6747268655.

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 21517036341321 in words is "twenty-one trillion, five hundred seventeen billion, thirty-six million, three hundred forty-one thousand, three hundred twenty-one".