21449727 has 24 divisors (see below), whose sum is σ = 35126000. Its totient is φ = 12503808.

The previous prime is 21449711. The next prime is 21449741. The reversal of 21449727 is 72794412.

It is not a de Polignac number, because 21449727 - 2⁴ = 21449711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21449691 and 21449700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21449797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2602 + ... + 7047.

Almost surely, 2^21449727 is an apocalyptic number.

21449727 is a deficient number, since it is larger than the sum of its proper divisors (13676273).

21449727 is a wasteful number, since it uses less digits than its factorization.

21449727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9687 (or 9684 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 21449727 is about 4631.3849980324. The cubic root of 21449727 is about 277.8479880775.

The spelling of 21449727 in words is "twenty-one million, four hundred forty-nine thousand, seven hundred twenty-seven".