21335448 has 32 divisors (see below), whose sum is σ = 53467200. Its totient is φ = 7094688.

The previous prime is 21335437. The next prime is 21335449. The reversal of 21335448 is 84453312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335449) 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, 12723 + ... + 14301.

It is an arithmetic number, because the mean of its divisors is an integer number (1670850).

Almost surely, 2^21335448 is an apocalyptic number.

It is an amenable number.

21335448 is an abundant number, since it is smaller than the sum of its proper divisors (32131752).

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

21335448 is a wasteful number, since it uses less digits than its factorization.

21335448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151 (or 2147 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 21335448 is about 4619.0310672261. The cubic root of 21335448 is about 277.3536733623.

The spelling of 21335448 in words is "twenty-one million, three hundred thirty-five thousand, four hundred forty-eight".