21422284 has 12 divisors (see below), whose sum is σ = 40372864. Its totient is φ = 9887184.

The previous prime is 21422273. The next prime is 21422321. The reversal of 21422284 is 48222412.

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, 205932 + ... + 206035.

Almost surely, 2^21422284 is an apocalyptic number.

It is an amenable number.

21422284 is a deficient number, since it is larger than the sum of its proper divisors (18950580).

21422284 is a wasteful number, since it uses less digits than its factorization.

21422284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411984 (or 411982 counting only the distinct ones).

The product of its digits is 2048, while the sum is 25.

The square root of 21422284 is about 4628.4213291359. The cubic root of 21422284 is about 277.7294436554.

Adding to 21422284 its reverse (48222412), we get a palindrome (69644696).

The spelling of 21422284 in words is "twenty-one million, four hundred twenty-two thousand, two hundred eighty-four".