21235344 has 40 divisors (see below), whose sum is σ = 59079552. Its totient is φ = 6533760.

The previous prime is 21235343. The next prime is 21235367. The reversal of 21235344 is 44353212.

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

It is not an unprimeable number, because it can be changed into a prime (21235343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16392 + ... + 17639.

Almost surely, 2^21235344 is an apocalyptic number.

21235344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21235344 is an abundant number, since it is smaller than the sum of its proper divisors (37844208).

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

21235344 is a wasteful number, since it uses less digits than its factorization.

21235344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34055 (or 34049 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 21235344 is about 4608.1822880611. The cubic root of 21235344 is about 276.9192203641.

Adding to 21235344 its reverse (44353212), we get a palindrome (65588556).

The spelling of 21235344 in words is "twenty-one million, two hundred thirty-five thousand, three hundred forty-four".