21323222321021 has 4 divisors (see below), whose sum is σ = 21323278396572. Its totient is φ = 21323166245472.

The previous prime is 21323222321003. The next prime is 21323222321029. The reversal of 21323222321021 is 12012322232312.

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 1853992684996 + 19469229636025 = 1361614^2 + 4412395^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323222321021 - 2²⁶ = 21323155212157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323222321029) 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, 27463466 + ... + 28229211.

It is an arithmetic number, because the mean of its divisors is an integer number (5330819599143).

Almost surely, 2^{21323222321021} is an apocalyptic number.

It is an amenable number.

21323222321021 is a deficient number, since it is larger than the sum of its proper divisors (56075551).

21323222321021 is an equidigital number, since it uses as much as digits as its factorization.

21323222321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56075550.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21323222321021 its reverse (12012322232312), we get a palindrome (33335544553333).

The spelling of 21323222321021 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred twenty-two million, three hundred twenty-one thousand, twenty-one".