21723305054 has 16 divisors (see below), whose sum is σ = 35551048176. Its totient is φ = 9873168000.

The previous prime is 21723305047. The next prime is 21723305059. The reversal of 21723305054 is 45050332712.

It is a self number, because there is not a number n which added to its sum of digits gives 21723305054.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21723305059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178694 + ... + 274550.

It is an arithmetic number, because the mean of its divisors is an integer number (2221940511).

Almost surely, 2^21723305054 is an apocalyptic number.

21723305054 is a deficient number, since it is larger than the sum of its proper divisors (13827743122).

21723305054 is a wasteful number, since it uses less digits than its factorization.

21723305054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106171.

The product of its (nonzero) digits is 25200, while the sum is 32.

Adding to 21723305054 its reverse (45050332712), we get a palindrome (66773637766).

The spelling of 21723305054 in words is "twenty-one billion, seven hundred twenty-three million, three hundred five thousand, fifty-four".