21134712 has 64 divisors (see below), whose sum is σ = 54604800. Its totient is φ = 6814080.

The previous prime is 21134657. The next prime is 21134713. The reversal of 21134712 is 21743112.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134538 + ... + 134694.

It is an arithmetic number, because the mean of its divisors is an integer number (853200).

Almost surely, 2^21134712 is an apocalyptic number.

It is an amenable number.

21134712 is an abundant number, since it is smaller than the sum of its proper divisors (33470088).

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

21134712 is a wasteful number, since it uses less digits than its factorization.

21134712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 312 counting only the distinct ones).

The product of its digits is 336, while the sum is 21.

The square root of 21134712 is about 4597.2504826255. The cubic root of 21134712 is about 276.4810974764.

Adding to 21134712 its reverse (21743112), we get a palindrome (42877824).

Subtracting 21134712 from its reverse (21743112), we obtain a square (608400 = 780²).

The spelling of 21134712 in words is "twenty-one million, one hundred thirty-four thousand, seven hundred twelve".