21543848 has 8 divisors (see below), whose sum is σ = 40394730. Its totient is φ = 10771920.

The previous prime is 21543829. The next prime is 21543859. The reversal of 21543848 is 84834512.

It can be written as a sum of positive squares in only one way, i.e., 10903204 + 10640644 = 3302^2 + 3262^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1346483 + ... + 1346498.

Almost surely, 2^21543848 is an apocalyptic number.

It is an amenable number.

21543848 is a deficient number, since it is larger than the sum of its proper divisors (18850882).

21543848 is a wasteful number, since it uses less digits than its factorization.

21543848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2692987 (or 2692983 counting only the distinct ones).

The product of its digits is 30720, while the sum is 35.

The square root of 21543848 is about 4641.5350908940. The cubic root of 21543848 is about 278.2537923557.

The spelling of 21543848 in words is "twenty-one million, five hundred forty-three thousand, eight hundred forty-eight".