21544321425323 has 4 divisors (see below), whose sum is σ = 22811634450360. Its totient is φ = 20277008400288.

The previous prime is 21544321425313. The next prime is 21544321425337. The reversal of 21544321425323 is 32352412344512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21544321425323 - 2⁴ = 21544321425307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21544321425313) 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, 633656512493 + ... + 633656512526.

It is an arithmetic number, because the mean of its divisors is an integer number (5702908612590).

Almost surely, 2^{21544321425323} is an apocalyptic number.

21544321425323 is a deficient number, since it is larger than the sum of its proper divisors (1267313025037).

21544321425323 is a wasteful number, since it uses less digits than its factorization.

21544321425323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267313025036.

The product of its digits is 691200, while the sum is 41.

Adding to 21544321425323 its reverse (32352412344512), we get a palindrome (53896733769835).

The spelling of 21544321425323 in words is "twenty-one trillion, five hundred forty-four billion, three hundred twenty-one million, four hundred twenty-five thousand, three hundred twenty-three".