21543025301321 has 16 divisors (see below), whose sum is σ = 21588393435264. Its totient is φ = 21497723380224.

The previous prime is 21543025301269. The next prime is 21543025301351. The reversal of 21543025301321 is 12310352034512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21543025301321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21543025301351) 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, 5956046105 + ... + 5956049721.

It is an arithmetic number, because the mean of its divisors is an integer number (1349274589704).

Almost surely, 2^{21543025301321} is an apocalyptic number.

It is an amenable number.

21543025301321 is a deficient number, since it is larger than the sum of its proper divisors (45368133943).

21543025301321 is a wasteful number, since it uses less digits than its factorization.

21543025301321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9760.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 21543025301321 its reverse (12310352034512), we get a palindrome (33853377335833).

The spelling of 21543025301321 in words is "twenty-one trillion, five hundred forty-three billion, twenty-five million, three hundred one thousand, three hundred twenty-one".