21332228 has 6 divisors (see below), whose sum is σ = 37331406. Its totient is φ = 10666112.

The previous prime is 21332221. The next prime is 21332251. The reversal of 21332228 is 82223312.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 611524 = 4552^2 + 782^2 .

It is not an unprimeable number, because it can be changed into a prime (21332221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2666525 + ... + 2666532.

It is an arithmetic number, because the mean of its divisors is an integer number (6221901).

Almost surely, 2^21332228 is an apocalyptic number.

It is an amenable number.

21332228 is a deficient number, since it is larger than the sum of its proper divisors (15999178).

21332228 is a wasteful number, since it uses less digits than its factorization.

21332228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333061 (or 5333059 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 21332228 is about 4618.6824961238. The cubic root of 21332228 is about 277.3397196867.

The spelling of 21332228 in words is "twenty-one million, three hundred thirty-two thousand, two hundred twenty-eight".