21335244 has 48 divisors (see below), whose sum is σ = 57120000. Its totient is φ = 6071616.

The previous prime is 21335231. The next prime is 21335257. The reversal of 21335244 is 44253312.

It is an interprime number because it is at equal distance from previous prime (21335231) and next prime (21335257).

It is a plaindrome in base 16.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 41662 + ... + 42170.

It is an arithmetic number, because the mean of its divisors is an integer number (1190000).

Almost surely, 2^21335244 is an apocalyptic number.

It is an amenable number.

21335244 is an abundant number, since it is smaller than the sum of its proper divisors (35784756).

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

21335244 is a wasteful number, since it uses less digits than its factorization.

21335244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022 (or 1020 counting only the distinct ones).

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

The square root of 21335244 is about 4619.0089846200. The cubic root of 21335244 is about 277.3527893823.

Adding to 21335244 its reverse (44253312), we get a palindrome (65588556).

The spelling of 21335244 in words is "twenty-one million, three hundred thirty-five thousand, two hundred forty-four".