21134744 has 16 divisors (see below), whose sum is σ = 40300200. Its totient is φ = 10388032.

The previous prime is 21134717. The next prime is 21134749. The reversal of 21134744 is 44743112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134749) 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, 21917 + ... + 22860.

Almost surely, 2^21134744 is an apocalyptic number.

It is an amenable number.

21134744 is a deficient number, since it is larger than the sum of its proper divisors (19165456).

21134744 is a wasteful number, since it uses less digits than its factorization.

21134744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44842 (or 44838 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 21134744 is about 4597.2539629653. The cubic root of 21134744 is about 276.4812370161.

Adding to 21134744 its reverse (44743112), we get a palindrome (65877856).

The spelling of 21134744 in words is "twenty-one million, one hundred thirty-four thousand, seven hundred forty-four".