21252548 has 12 divisors (see below), whose sum is σ = 37328172. Its totient is φ = 10587360.

The previous prime is 21252547. The next prime is 21252551. The reversal of 21252548 is 84525212.

It can be written as a sum of positive squares in 2 ways, for example, as 9746884 + 11505664 = 3122^2 + 3392^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21252548.

It is not an unprimeable number, because it can be changed into a prime (21252547) 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, 8483 + ... + 10698.

It is an arithmetic number, because the mean of its divisors is an integer number (3110681).

Almost surely, 2^21252548 is an apocalyptic number.

It is an amenable number.

21252548 is a deficient number, since it is larger than the sum of its proper divisors (16075624).

21252548 is a wasteful number, since it uses less digits than its factorization.

21252548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19462 (or 19460 counting only the distinct ones).

The product of its digits is 6400, while the sum is 29.

The square root of 21252548 is about 4610.0485897656. The cubic root of 21252548 is about 276.9939830221.

The spelling of 21252548 in words is "twenty-one million, two hundred fifty-two thousand, five hundred forty-eight".