21305322 has 32 divisors (see below), whose sum is σ = 48504960. Its totient is φ = 6927840.

The previous prime is 21305321. The next prime is 21305341. The reversal of 21305322 is 22350312.

21305322 is a `hidden beast` number, since 2 + 130 + 532 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21305295 and 21305304.

It is not an unprimeable number, because it can be changed into a prime (21305321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2598 + ... + 7025.

It is an arithmetic number, because the mean of its divisors is an integer number (1515780).

Almost surely, 2^21305322 is an apocalyptic number.

21305322 is an abundant number, since it is smaller than the sum of its proper divisors (27199638).

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

21305322 is a wasteful number, since it uses less digits than its factorization.

21305322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9675 (or 9669 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21305322 is about 4615.7688416991. The cubic root of 21305322 is about 277.2230692369.

Adding to 21305322 its reverse (22350312), we get a palindrome (43655634).

The spelling of 21305322 in words is "twenty-one million, three hundred five thousand, three hundred twenty-two".