21198384 has 30 divisors (see below), whose sum is σ = 59326436. Its totient is φ = 7066080.

The previous prime is 21198377. The next prime is 21198407. The reversal of 21198384 is 48389112.

It is a super-2 number, since 2×21198384² = 898742968422912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73462 + ... + 73749.

Almost surely, 2^21198384 is an apocalyptic number.

21198384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21198384 is an abundant number, since it is smaller than the sum of its proper divisors (38128052).

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

21198384 is a wasteful number, since it uses less digits than its factorization.

21198384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147225 (or 147216 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 21198384 is about 4604.1702835582. The cubic root of 21198384 is about 276.7584682696.

The spelling of 21198384 in words is "twenty-one million, one hundred ninety-eight thousand, three hundred eighty-four".