21840548 has 12 divisors (see below), whose sum is σ = 38572380. Its totient is φ = 10819872.

The previous prime is 21840541. The next prime is 21840551. The reversal of 21840548 is 84504812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6801664 + 15038884 = 2608^2 + 3878^2 .

It is not an unprimeable number, because it can be changed into a prime (21840541) 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, 24611 + ... + 25482.

It is an arithmetic number, because the mean of its divisors is an integer number (3214365).

Almost surely, 2^21840548 is an apocalyptic number.

It is an amenable number.

21840548 is a deficient number, since it is larger than the sum of its proper divisors (16731832).

21840548 is a wasteful number, since it uses less digits than its factorization.

21840548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50206 (or 50204 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 21840548 is about 4673.3872084389. The cubic root of 21840548 is about 279.5253352439.

The spelling of 21840548 in words is "twenty-one million, eight hundred forty thousand, five hundred forty-eight".