21214384 has 40 divisors (see below), whose sum is σ = 42778512. Its totient is φ = 10183680.

The previous prime is 21214381. The next prime is 21214429. The reversal of 21214384 is 48341212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214381) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 47667 + ... + 48109.

Almost surely, 2^21214384 is an apocalyptic number.

It is an amenable number.

21214384 is an abundant number, since it is smaller than the sum of its proper divisors (21564128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21214384 is a wasteful number, since it uses less digits than its factorization.

21214384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 559 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 21214384 is about 4605.9075110124. The cubic root of 21214384 is about 276.8280808381.

Adding to 21214384 its reverse (48341212), we get a palindrome (69555596).

The spelling of 21214384 in words is "twenty-one million, two hundred fourteen thousand, three hundred eighty-four".