21032117570321 has 16 divisors (see below), whose sum is σ = 24709369066368. Its totient is φ = 17649109526400.

The previous prime is 21032117570209. The next prime is 21032117570323. The reversal of 21032117570321 is 12307571123012.

It is not a de Polignac number, because 21032117570321 - 2¹⁸ = 21032117308177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032117570323) 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, 11155100 + ... + 12903506.

It is an arithmetic number, because the mean of its divisors is an integer number (1544335566648).

Almost surely, 2^{21032117570321} is an apocalyptic number.

It is an amenable number.

21032117570321 is a deficient number, since it is larger than the sum of its proper divisors (3677251496047).

21032117570321 is a wasteful number, since it uses less digits than its factorization.

21032117570321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832552.

The product of its (nonzero) digits is 17640, while the sum is 35.

Adding to 21032117570321 its reverse (12307571123012), we get a palindrome (33339688693333).

The spelling of 21032117570321 in words is "twenty-one trillion, thirty-two billion, one hundred seventeen million, five hundred seventy thousand, three hundred twenty-one".