21134716 has 12 divisors (see below), whose sum is σ = 37256688. Its totient is φ = 10489952.

The previous prime is 21134713. The next prime is 21134717. The reversal of 21134716 is 61743112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18736 + ... + 19831.

It is an arithmetic number, because the mean of its divisors is an integer number (3104724).

Almost surely, 2^21134716 is an apocalyptic number.

It is an amenable number.

21134716 is a deficient number, since it is larger than the sum of its proper divisors (16121972).

21134716 is a wasteful number, since it uses less digits than its factorization.

21134716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38708 (or 38706 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 21134716 is about 4597.2509176681. The cubic root of 21134716 is about 276.4811149189.

Adding to 21134716 its reverse (61743112), we get a palindrome (82877828).

The spelling of 21134716 in words is "twenty-one million, one hundred thirty-four thousand, seven hundred sixteen".