21342328 has 32 divisors (see below), whose sum is σ = 46216800. Its totient is φ = 9050112.

The previous prime is 21342311. The next prime is 21342329. The reversal of 21342328 is 82324312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3468 + ... + 7396.

It is an arithmetic number, because the mean of its divisors is an integer number (1444275).

Almost surely, 2^21342328 is an apocalyptic number.

21342328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21342328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23108400).

21342328 is an abundant number, since it is smaller than the sum of its proper divisors (24874472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21342328 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (21342327) it forms an eRAP, since the sums of their prime factors are consecutive (4038 and 4039).

21342328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039 (or 4035 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 21342328 is about 4619.7757521334. The cubic root of 21342328 is about 277.3834827231.

The spelling of 21342328 in words is "twenty-one million, three hundred forty-two thousand, three hundred twenty-eight".