21323054 has 16 divisors (see below), whose sum is σ = 34387200. Its totient is φ = 9884664.

The previous prime is 21323053. The next prime is 21323059. The reversal of 21323054 is 45032312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4184 + ... + 7755.

It is an arithmetic number, because the mean of its divisors is an integer number (2149200).

Almost surely, 2^21323054 is an apocalyptic number.

21323054 is a deficient number, since it is larger than the sum of its proper divisors (13064146).

21323054 is a wasteful number, since it uses less digits than its factorization.

21323054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12007.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21323054 is about 4617.6892489642. The cubic root of 21323054 is about 277.2999570108.

Adding to 21323054 its reverse (45032312), we get a palindrome (66355366).

The spelling of 21323054 in words is "twenty-one million, three hundred twenty-three thousand, fifty-four".