21339224 has 32 divisors (see below), whose sum is σ = 40960080. Its totient is φ = 10420224.

The previous prime is 21339221. The next prime is 21339247. The reversal of 21339224 is 42293312.

It is a junction number, because it is equal to n+sod(n) for n = 21339193 and 21339202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21339221) 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, 82904 + ... + 83160.

Almost surely, 2^21339224 is an apocalyptic number.

It is an amenable number.

21339224 is a deficient number, since it is larger than the sum of its proper divisors (19620856).

21339224 is a wasteful number, since it uses less digits than its factorization.

21339224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 463 counting only the distinct ones).

The product of its digits is 2592, while the sum is 26.

The square root of 21339224 is about 4619.4397928753. The cubic root of 21339224 is about 277.3700346420.

The spelling of 21339224 in words is "twenty-one million, three hundred thirty-nine thousand, two hundred twenty-four".