21324308 has 12 divisors (see below), whose sum is σ = 39281760. Its totient is φ = 10100952.

The previous prime is 21324301. The next prime is 21324313. The reversal of 21324308 is 80342312.

It is a super-2 number, since 2×21324308² = 909452223357728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324301) 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, 140216 + ... + 140367.

It is an arithmetic number, because the mean of its divisors is an integer number (3273480).

Almost surely, 2^21324308 is an apocalyptic number.

It is an amenable number.

21324308 is a deficient number, since it is larger than the sum of its proper divisors (17957452).

21324308 is a wasteful number, since it uses less digits than its factorization.

21324308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280606 (or 280604 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21324308 is about 4617.8250291669. The cubic root of 21324308 is about 277.3053928696.

The spelling of 21324308 in words is "twenty-one million, three hundred twenty-four thousand, three hundred eight".