21259324 has 12 divisors (see below), whose sum is σ = 37239664. Its totient is φ = 10619424.

The previous prime is 21259321. The next prime is 21259327. The reversal of 21259324 is 42395212.

It is an interprime number because it is at equal distance from previous prime (21259321) and next prime (21259327).

It is a junction number, because it is equal to n+sod(n) for n = 21259292 and 21259301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21259321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3952 + ... + 7624.

Almost surely, 2^21259324 is an apocalyptic number.

It is an amenable number.

21259324 is a deficient number, since it is larger than the sum of its proper divisors (15980340).

21259324 is a wasteful number, since it uses less digits than its factorization.

21259324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124 (or 5122 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 21259324 is about 4610.7834475282. The cubic root of 21259324 is about 277.0234181090.

It can be divided in two parts, 2125 and 9324, that added together give a square (11449 = 107²).

The spelling of 21259324 in words is "twenty-one million, two hundred fifty-nine thousand, three hundred twenty-four".