21544998 has 8 divisors (see below), whose sum is σ = 43090008. Its totient is φ = 7181664.

The previous prime is 21544987. The next prime is 21545003. The reversal of 21544998 is 89944512.

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

21544998 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1795411 + ... + 1795422.

It is an arithmetic number, because the mean of its divisors is an integer number (5386251).

Almost surely, 2^21544998 is an apocalyptic number.

21544998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21544998 is a wasteful number, since it uses less digits than its factorization.

21544998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590838.

The product of its digits is 103680, while the sum is 42.

The square root of 21544998 is about 4641.6589706699. The cubic root of 21544998 is about 278.2587432844.

The spelling of 21544998 in words is "twenty-one million, five hundred forty-four thousand, nine hundred ninety-eight".