21306322 has 8 divisors (see below), whose sum is σ = 32639616. Its totient is φ = 10426452.

The previous prime is 21306317. The next prime is 21306343. The reversal of 21306322 is 22360312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21306322.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113238 + ... + 113425.

It is an arithmetic number, because the mean of its divisors is an integer number (4079952).

Almost surely, 2^21306322 is an apocalyptic number.

21306322 is a deficient number, since it is larger than the sum of its proper divisors (11333294).

21306322 is a wasteful number, since it uses less digits than its factorization.

21306322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226712.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 21306322 is about 4615.8771647434. The cubic root of 21306322 is about 277.2274064745.

Adding to 21306322 its reverse (22360312), we get a palindrome (43666634).

The spelling of 21306322 in words is "twenty-one million, three hundred six thousand, three hundred twenty-two".