21444321204423 has 24 divisors (see below), whose sum is σ = 33358063519872. Its totient is φ = 13196414155968.

The previous prime is 21444321204413. The next prime is 21444321204451. The reversal of 21444321204423 is 32440212344412.

21444321204423 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 4 + 3 + 21 + 204 + 423 = 666.

It is not a de Polignac number, because 21444321204423 - 2⁸ = 21444321204167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444321204413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18943690 + ... + 20043752.

It is an arithmetic number, because the mean of its divisors is an integer number (1389919313328).

Almost surely, 2^{21444321204423} is an apocalyptic number.

21444321204423 is a deficient number, since it is larger than the sum of its proper divisors (11913742315449).

21444321204423 is a wasteful number, since it uses less digits than its factorization.

21444321204423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266695 (or 1266692 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 36.

Adding to 21444321204423 its reverse (32440212344412), we get a palindrome (53884533548835).

The spelling of 21444321204423 in words is "twenty-one trillion, four hundred forty-four billion, three hundred twenty-one million, two hundred four thousand, four hundred twenty-three".