21238484 has 12 divisors (see below), whose sum is σ = 37206708. Its totient is φ = 10608000.

The previous prime is 21238471. The next prime is 21238487. The reversal of 21238484 is 48483212.

It can be written as a sum of positive squares in 2 ways, for example, as 6646084 + 14592400 = 2578^2 + 3820^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21238484.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21238487) 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, 2594 + ... + 7014.

It is an arithmetic number, because the mean of its divisors is an integer number (3100559).

Almost surely, 2^21238484 is an apocalyptic number.

It is an amenable number.

21238484 is a deficient number, since it is larger than the sum of its proper divisors (15968224).

21238484 is a wasteful number, since it uses less digits than its factorization.

21238484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5626 (or 5624 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 21238484 is about 4608.5229737954. The cubic root of 21238484 is about 276.9328687342.

The spelling of 21238484 in words is "twenty-one million, two hundred thirty-eight thousand, four hundred eighty-four".