21544898 has 8 divisors (see below), whose sum is σ = 34018320. Its totient is φ = 10205460.

The previous prime is 21544889. The next prime is 21544903. The reversal of 21544898 is 89844512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283448 + ... + 283523.

It is an arithmetic number, because the mean of its divisors is an integer number (4252290).

Almost surely, 2^21544898 is an apocalyptic number.

21544898 is a deficient number, since it is larger than the sum of its proper divisors (12473422).

21544898 is a wasteful number, since it uses less digits than its factorization.

21544898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566992.

The product of its digits is 92160, while the sum is 41.

The square root of 21544898 is about 4641.6481986467. The cubic root of 21544898 is about 278.2583127758.

The spelling of 21544898 in words is "twenty-one million, five hundred forty-four thousand, eight hundred ninety-eight".