21122284 has 12 divisors (see below), whose sum is σ = 38156608. Its totient is φ = 10220400.

The previous prime is 21122267. The next prime is 21122291. The reversal of 21122284 is 48222112.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

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 in 3 ways as a sum of consecutive naturals, for example, 85047 + ... + 85294.

Almost surely, 2^21122284 is an apocalyptic number.

It is an amenable number.

21122284 is a deficient number, since it is larger than the sum of its proper divisors (17034324).

21122284 is a wasteful number, since it uses less digits than its factorization.

21122284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170376 (or 170374 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

The square root of 21122284 is about 4595.8986063663. The cubic root of 21122284 is about 276.4268931132.

Adding to 21122284 its reverse (48222112), we get a palindrome (69344396).

The spelling of 21122284 in words is "twenty-one million, one hundred twenty-two thousand, two hundred eighty-four".