21322316 has 6 divisors (see below), whose sum is σ = 37314060. Its totient is φ = 10661156.

The previous prime is 21322307. The next prime is 21322319. The reversal of 21322316 is 61322312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21322319) 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 as a sum of consecutive naturals, namely, 2665286 + ... + 2665293.

It is an arithmetic number, because the mean of its divisors is an integer number (6219010).

It is a self-describing number.

Almost surely, 2^21322316 is an apocalyptic number.

It is an amenable number.

21322316 is a deficient number, since it is larger than the sum of its proper divisors (15991744).

21322316 is a wasteful number, since it uses less digits than its factorization.

21322316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330583 (or 5330581 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 21322316 is about 4617.6093381749. The cubic root of 21322316 is about 277.2967578173.

Adding to 21322316 its reverse (61322312), we get a palindrome (82644628).

The spelling of 21322316 in words is "twenty-one million, three hundred twenty-two thousand, three hundred sixteen".