21864548 has 12 divisors (see below), whose sum is σ = 39497472. Its totient is φ = 10579560.

The previous prime is 21864547. The next prime is 21864553. The reversal of 21864548 is 84546812.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21864547) 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, 88040 + ... + 88287.

It is an arithmetic number, because the mean of its divisors is an integer number (3291456).

Almost surely, 2^21864548 is an apocalyptic number.

It is an amenable number.

21864548 is a deficient number, since it is larger than the sum of its proper divisors (17632924).

21864548 is a wasteful number, since it uses less digits than its factorization.

21864548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176362 (or 176360 counting only the distinct ones).

The product of its digits is 61440, while the sum is 38.

The square root of 21864548 is about 4675.9542341644. The cubic root of 21864548 is about 279.6276854267.

The spelling of 21864548 in words is "twenty-one million, eight hundred sixty-four thousand, five hundred forty-eight".