21115450222321 has 64 divisors (see below), whose sum is σ = 26740416729600. Its totient is φ = 16230075181056.

The previous prime is 21115450222313. The next prime is 21115450222369. The reversal of 21115450222321 is 12322205451112.

It is a cyclic number.

It is not a de Polignac number, because 21115450222321 - 2³ = 21115450222313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21115450222301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 942769095 + ... + 942791491.

It is an arithmetic number, because the mean of its divisors is an integer number (417819011400).

Almost surely, 2^{21115450222321} is an apocalyptic number.

It is an amenable number.

21115450222321 is a deficient number, since it is larger than the sum of its proper divisors (5624966507279).

21115450222321 is a wasteful number, since it uses less digits than its factorization.

21115450222321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24538.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 21115450222321 its reverse (12322205451112), we get a palindrome (33437655673433).

The spelling of 21115450222321 in words is "twenty-one trillion, one hundred fifteen billion, four hundred fifty million, two hundred twenty-two thousand, three hundred twenty-one".