21342048 has 144 divisors (see below), whose sum is σ = 70383600. Its totient is φ = 5612544.

The previous prime is 21342047. The next prime is 21342053. The reversal of 21342048 is 84024312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342047) 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 23 ways as a sum of consecutive naturals, for example, 60978 + ... + 61326.

It is an arithmetic number, because the mean of its divisors is an integer number (488775).

Almost surely, 2^21342048 is an apocalyptic number.

21342048 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 21342048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35191800).

21342048 is an abundant number, since it is smaller than the sum of its proper divisors (49041552).

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

21342048 is a wasteful number, since it uses less digits than its factorization.

21342048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 21342048 is about 4619.7454475328. The cubic root of 21342048 is about 277.3822696765.

The spelling of 21342048 in words is "twenty-one million, three hundred forty-two thousand, forty-eight".