21427024 has 20 divisors (see below), whose sum is σ = 41622336. Its totient is φ = 10685792.

The previous prime is 21427013. The next prime is 21427037. The reversal of 21427024 is 42072412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21426986 and 21427004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5577 + ... + 8599.

Almost surely, 2^21427024 is an apocalyptic number.

It is an amenable number.

21427024 is a deficient number, since it is larger than the sum of its proper divisors (20195312).

21427024 is a wasteful number, since it uses less digits than its factorization.

21427024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3474 (or 3468 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 21427024 is about 4628.9333544565. The cubic root of 21427024 is about 277.7499260727.

Adding to 21427024 its reverse (42072412), we get a palindrome (63499436).

The spelling of 21427024 in words is "twenty-one million, four hundred twenty-seven thousand, twenty-four".