21323223023221 has 16 divisors (see below), whose sum is σ = 25653950300160. Its totient is φ = 17313780337200.

The previous prime is 21323223023189. The next prime is 21323223023279. The reversal of 21323223023221 is 12232032232312.

It is a cyclic number.

It is not a de Polignac number, because 21323223023221 - 2⁵ = 21323223023189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21323223023221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323223023281) 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 15 ways as a sum of consecutive naturals, for example, 4346461 + ... + 7844626.

It is an arithmetic number, because the mean of its divisors is an integer number (1603371893760).

Almost surely, 2^{21323223023221} is an apocalyptic number.

It is an amenable number.

21323223023221 is a deficient number, since it is larger than the sum of its proper divisors (4330727276939).

21323223023221 is a wasteful number, since it uses less digits than its factorization.

21323223023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12204264.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 21323223023221 its reverse (12232032232312), we get a palindrome (33555255255533).

The spelling of 21323223023221 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred twenty-three million, twenty-three thousand, two hundred twenty-one".