21498224 has 20 divisors (see below), whose sum is σ = 45439800. Its totient is φ = 9771840.

The previous prime is 21498209. The next prime is 21498229. The reversal of 21498224 is 42289412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21498229) 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, 60899 + ... + 61250.

It is an arithmetic number, because the mean of its divisors is an integer number (2271990).

Almost surely, 2^21498224 is an apocalyptic number.

It is an amenable number.

21498224 is an abundant number, since it is smaller than the sum of its proper divisors (23941576).

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

21498224 is a wasteful number, since it uses less digits than its factorization.

21498224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122168 (or 122162 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 21498224 is about 4636.6177327876. The cubic root of 21498224 is about 278.0572316309.

The spelling of 21498224 in words is "twenty-one million, four hundred ninety-eight thousand, two hundred twenty-four".