21213220320323 has 16 divisors (see below), whose sum is σ = 22343947008000. Its totient is φ = 20083921734240.

The previous prime is 21213220320277. The next prime is 21213220320337. The reversal of 21213220320323 is 32302302231212.

It is a cyclic number.

It is not a de Polignac number, because 21213220320323 - 2²⁰ = 21213219271747 is a prime.

It is a super-3 number, since 3×21213220320323³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213220320292 and 21213220320301.

It is not an unprimeable number, because it can be changed into a prime (21213220320343) 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, 205441118 + ... + 205544348.

It is an arithmetic number, because the mean of its divisors is an integer number (1396496688000).

Almost surely, 2^{21213220320323} is an apocalyptic number.

21213220320323 is a deficient number, since it is larger than the sum of its proper divisors (1130726687677).

21213220320323 is a wasteful number, since it uses less digits than its factorization.

21213220320323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110042.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21213220320323 its reverse (32302302231212), we get a palindrome (53515522551535).

The spelling of 21213220320323 in words is "twenty-one trillion, two hundred thirteen billion, two hundred twenty million, three hundred twenty thousand, three hundred twenty-three".