21714284 has 6 divisors (see below), whose sum is σ = 38000004. Its totient is φ = 10857140.

The previous prime is 21714281. The next prime is 21714313. The reversal of 21714284 is 48241712.

It is not an unprimeable number, because it can be changed into a prime (21714281) by changing a digit.

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 as a sum of consecutive naturals, namely, 2714282 + ... + 2714289.

It is an arithmetic number, because the mean of its divisors is an integer number (6333334).

Almost surely, 2^21714284 is an apocalyptic number.

It is an amenable number.

21714284 is a deficient number, since it is larger than the sum of its proper divisors (16285720).

21714284 is a wasteful number, since it uses less digits than its factorization.

21714284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428575 (or 5428573 counting only the distinct ones).

The product of its digits is 3584, while the sum is 29.

The square root of 21714284 is about 4659.8587961439. The cubic root of 21714284 is about 278.9856323669.

Adding to 21714284 its reverse (48241712), we get a palindrome (69955996).

The spelling of 21714284 in words is "twenty-one million, seven hundred fourteen thousand, two hundred eighty-four".