21460424 has 32 divisors (see below), whose sum is σ = 43092000. Its totient is φ = 9988992.

The previous prime is 21460423. The next prime is 21460441. The reversal of 21460424 is 42406412.

It is a self number, because there is not a number n which added to its sum of digits gives 21460424.

It is not an unprimeable number, because it can be changed into a prime (21460423) 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 7 ways as a sum of consecutive naturals, for example, 7772 + ... + 10164.

It is an arithmetic number, because the mean of its divisors is an integer number (1346625).

Almost surely, 2^21460424 is an apocalyptic number.

It is an amenable number.

21460424 is an abundant number, since it is smaller than the sum of its proper divisors (21631576).

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

21460424 is a wasteful number, since it uses less digits than its factorization.

21460424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477 (or 2473 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 21460424 is about 4632.5396922207. The cubic root of 21460424 is about 277.8941680902.

Adding to 21460424 its reverse (42406412), we get a palindrome (63866836).

The spelling of 21460424 in words is "twenty-one million, four hundred sixty thousand, four hundred twenty-four".