21434284 has 12 divisors (see below), whose sum is σ = 37897384. Its totient is φ = 10606464.

The previous prime is 21434279. The next prime is 21434293. The reversal of 21434284 is 48243412.

It is a happy number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 27234 + ... + 28009.

Almost surely, 2^21434284 is an apocalyptic number.

It is an amenable number.

21434284 is a deficient number, since it is larger than the sum of its proper divisors (16463100).

21434284 is a wasteful number, since it uses less digits than its factorization.

21434284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55344 (or 55342 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 21434284 is about 4629.7174859812. The cubic root of 21434284 is about 277.7812920207.

Adding to 21434284 its reverse (48243412), we get a palindrome (69677696).

The spelling of 21434284 in words is "twenty-one million, four hundred thirty-four thousand, two hundred eighty-four".