21134784 has 56 divisors (see below), whose sum is σ = 61008768. Its totient is φ = 6403840.

The previous prime is 21134761. The next prime is 21134809. The reversal of 21134784 is 48743112.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2892 + ... + 7115.

Almost surely, 2^21134784 is an apocalyptic number.

21134784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21134784 is an abundant number, since it is smaller than the sum of its proper divisors (39873984).

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

21134784 is a wasteful number, since it uses less digits than its factorization.

21134784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10033 (or 10023 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 21134784 is about 4597.2583133864. The cubic root of 21134784 is about 276.4814114404.

Adding to 21134784 its reverse (48743112), we get a palindrome (69877896).

The spelling of 21134784 in words is "twenty-one million, one hundred thirty-four thousand, seven hundred eighty-four".