21227316 has 24 divisors (see below), whose sum is σ = 54033504. Its totient is φ = 6432480.

The previous prime is 21227309. The next prime is 21227317. The reversal of 21227316 is 61372212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227317) 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 7 ways as a sum of consecutive naturals, for example, 80275 + ... + 80538.

It is an arithmetic number, because the mean of its divisors is an integer number (2251396).

Almost surely, 2^21227316 is an apocalyptic number.

It is an amenable number.

21227316 is an abundant number, since it is smaller than the sum of its proper divisors (32806188).

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

21227316 is a wasteful number, since it uses less digits than its factorization.

21227316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160831 (or 160829 counting only the distinct ones).

The product of its digits is 1008, while the sum is 24.

The square root of 21227316 is about 4607.3111464280. The cubic root of 21227316 is about 276.8843196234.

Adding to 21227316 its reverse (61372212), we get a palindrome (82599528).

Subtracting 21227316 from its reverse (61372212), we obtain a square (40144896 = 6336²).

The spelling of 21227316 in words is "twenty-one million, two hundred twenty-seven thousand, three hundred sixteen".