21541448 has 16 divisors (see below), whose sum is σ = 42766380. Its totient is φ = 10137088.

The previous prime is 21541447. The next prime is 21541451. The reversal of 21541448 is 84414512.

It can be written as a sum of positive squares in 2 ways, for example, as 17123044 + 4418404 = 4138^2 + 2102^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21541448.

It is not an unprimeable number, because it can be changed into a prime (21541447) 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, 79061 + ... + 79332.

Almost surely, 2^21541448 is an apocalyptic number.

It is an amenable number.

21541448 is a deficient number, since it is larger than the sum of its proper divisors (21224932).

21541448 is a wasteful number, since it uses less digits than its factorization.

21541448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158416 (or 158412 counting only the distinct ones).

The product of its digits is 5120, while the sum is 29.

The square root of 21541448 is about 4641.2765485371. The cubic root of 21541448 is about 278.2434594151.

The spelling of 21541448 in words is "twenty-one million, five hundred forty-one thousand, four hundred forty-eight".