21338324 has 18 divisors (see below), whose sum is σ = 43439130. Its totient is φ = 9144912.

The previous prime is 21338321. The next prime is 21338333. The reversal of 21338324 is 42383312.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 2502724 = 4340^2 + 1582^2 .

It is a super-2 number, since 2×21338324² = 910648142257952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21338293 and 21338302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338321) 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 5 ways as a sum of consecutive naturals, for example, 54239 + ... + 54630.

It is an arithmetic number, because the mean of its divisors is an integer number (2413285).

Almost surely, 2^21338324 is an apocalyptic number.

It is an amenable number.

21338324 is an abundant number, since it is smaller than the sum of its proper divisors (22100806).

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

21338324 is a wasteful number, since it uses less digits than its factorization.

21338324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108887 (or 108878 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 21338324 is about 4619.3423774386. The cubic root of 21338324 is about 277.3661351478.

The spelling of 21338324 in words is "twenty-one million, three hundred thirty-eight thousand, three hundred twenty-four".