21498424 has 32 divisors (see below), whose sum is σ = 43084800. Its totient is φ = 10026720.

The previous prime is 21498419. The next prime is 21498431. The reversal of 21498424 is 42489412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21498424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9129 + ... + 11239.

It is an arithmetic number, because the mean of its divisors is an integer number (1346400).

Almost surely, 2^21498424 is an apocalyptic number.

It is an amenable number.

21498424 is an abundant number, since it is smaller than the sum of its proper divisors (21586376).

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

21498424 is a wasteful number, since it uses less digits than its factorization.

21498424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203 (or 2199 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 21498424 is about 4636.6393001828. The cubic root of 21498424 is about 278.0580938924.

The spelling of 21498424 in words is "twenty-one million, four hundred ninety-eight thousand, four hundred twenty-four".