21554548 has 12 divisors (see below), whose sum is σ = 38937472. Its totient is φ = 10429560.

The previous prime is 21554543. The next prime is 21554557. The reversal of 21554548 is 84545512.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554543) 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, 86790 + ... + 87037.

Almost surely, 2^21554548 is an apocalyptic number.

It is an amenable number.

21554548 is a deficient number, since it is larger than the sum of its proper divisors (17382924).

21554548 is a wasteful number, since it uses less digits than its factorization.

21554548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173862 (or 173860 counting only the distinct ones).

The product of its digits is 32000, while the sum is 34.

The square root of 21554548 is about 4642.6875837170. The cubic root of 21554548 is about 278.2998507139.

The spelling of 21554548 in words is "twenty-one million, five hundred fifty-four thousand, five hundred forty-eight".