21213311030321 has 4 divisors (see below), whose sum is σ = 22461152855652. Its totient is φ = 19965469204992.

The previous prime is 21213311030293. The next prime is 21213311030333. The reversal of 21213311030321 is 12303011331212.

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 13155774613921 + 8057536416400 = 3627089^2 + 2838580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213311030321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213311030221) 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 3 ways as a sum of consecutive naturals, for example, 623920912640 + ... + 623920912673.

It is an arithmetic number, because the mean of its divisors is an integer number (5615288213913).

Almost surely, 2^{21213311030321} is an apocalyptic number.

It is an amenable number.

21213311030321 is a deficient number, since it is larger than the sum of its proper divisors (1247841825331).

21213311030321 is a wasteful number, since it uses less digits than its factorization.

21213311030321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247841825330.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21213311030321 its reverse (12303011331212), we get a palindrome (33516322361533).

The spelling of 21213311030321 in words is "twenty-one trillion, two hundred thirteen billion, three hundred eleven million, thirty thousand, three hundred twenty-one".