21376228 has 6 divisors (see below), whose sum is σ = 37408406. Its totient is φ = 10688112.

The previous prime is 21376217. The next prime is 21376253. The reversal of 21376228 is 82267312.

It can be written as a sum of positive squares in only one way, i.e., 11778624 + 9597604 = 3432^2 + 3098^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21376228.

It is an unprimeable number.

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, 2672025 + ... + 2672032.

Almost surely, 2^21376228 is an apocalyptic number.

It is an amenable number.

21376228 is a deficient number, since it is larger than the sum of its proper divisors (16032178).

21376228 is a wasteful number, since it uses less digits than its factorization.

21376228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5344061 (or 5344059 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 21376228 is about 4623.4433055895. The cubic root of 21376228 is about 277.5302696737.

The spelling of 21376228 in words is "twenty-one million, three hundred seventy-six thousand, two hundred twenty-eight".