21424348 has 48 divisors (see below), whose sum is σ = 42900480. Its totient is φ = 9273600.

The previous prime is 21424327. The next prime is 21424357. The reversal of 21424348 is 84342412.

It is a happy number.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 154063 + ... + 154201.

It is an arithmetic number, because the mean of its divisors is an integer number (893760).

Almost surely, 2^21424348 is an apocalyptic number.

It is an amenable number.

21424348 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

21424348 is a wasteful number, since it uses less digits than its factorization.

21424348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 296 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 21424348 is about 4628.6442939591. The cubic root of 21424348 is about 277.7383629527.

The spelling of 21424348 in words is "twenty-one million, four hundred twenty-four thousand, three hundred forty-eight".