21113214020321 has 4 divisors (see below), whose sum is σ = 21222608911812. Its totient is φ = 21003819128832.

The previous prime is 21113214020281. The next prime is 21113214020357. The reversal of 21113214020321 is 12302041231112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5895693891025 + 15217520129296 = 2428105^2 + 3900964^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113214020321 - 2⁶ = 21113214020257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113213020321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54697445456 + ... + 54697445841.

It is an arithmetic number, because the mean of its divisors is an integer number (5305652227953).

Almost surely, 2^{21113214020321} is an apocalyptic number.

It is an amenable number.

21113214020321 is a deficient number, since it is larger than the sum of its proper divisors (109394891491).

21113214020321 is a wasteful number, since it uses less digits than its factorization.

21113214020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109394891490.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21113214020321 its reverse (12302041231112), we get a palindrome (33415255251433).

The spelling of 21113214020321 in words is "twenty-one trillion, one hundred thirteen billion, two hundred fourteen million, twenty thousand, three hundred twenty-one".