21134320 has 20 divisors (see below), whose sum is σ = 49137480. Its totient is φ = 8453696.

The previous prime is 21134293. The next prime is 21134353. The reversal of 21134320 is 2343112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21134294 and 21134303.

It is a congruent 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, 132010 + ... + 132169.

It is an arithmetic number, because the mean of its divisors is an integer number (2456874).

Almost surely, 2^21134320 is an apocalyptic number.

21134320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21134320 is an abundant number, since it is smaller than the sum of its proper divisors (28003160).

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

21134320 is a wasteful number, since it uses less digits than its factorization.

21134320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264192 (or 264186 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21134320 is about 4597.2078482488. The cubic root of 21134320 is about 276.4793881043.

Adding to 21134320 its reverse (2343112), we get a palindrome (23477432).

The spelling of 21134320 in words is "twenty-one million, one hundred thirty-four thousand, three hundred twenty".