21622316 has 6 divisors (see below), whose sum is σ = 37839060. Its totient is φ = 10811156.

The previous prime is 21622301. The next prime is 21622327. The reversal of 21622316 is 61322612.

It is a junction number, because it is equal to n+sod(n) for n = 21622291 and 21622300.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2702786 + ... + 2702793.

It is an arithmetic number, because the mean of its divisors is an integer number (6306510).

Almost surely, 2^21622316 is an apocalyptic number.

It is an amenable number.

21622316 is a deficient number, since it is larger than the sum of its proper divisors (16216744).

21622316 is a wasteful number, since it uses less digits than its factorization.

21622316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5405583 (or 5405581 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 21622316 is about 4649.9802150117. The cubic root of 21622316 is about 278.5912059845.

Adding to 21622316 its reverse (61322612), we get a palindrome (82944928).

The spelling of 21622316 in words is "twenty-one million, six hundred twenty-two thousand, three hundred sixteen".