21198548 has 24 divisors (see below), whose sum is σ = 44241792. Its totient is φ = 8689824.

The previous prime is 21198503. The next prime is 21198553. The reversal of 21198548 is 84589112.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 15815 + ... + 17102.

It is an arithmetic number, because the mean of its divisors is an integer number (1843408).

Almost surely, 2^21198548 is an apocalyptic number.

21198548 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21198548 is an abundant number, since it is smaller than the sum of its proper divisors (23043244).

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

21198548 is a wasteful number, since it uses less digits than its factorization.

21198548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32951 (or 32949 counting only the distinct ones).

The product of its digits is 23040, while the sum is 38.

The square root of 21198548 is about 4604.1880934645. The cubic root of 21198548 is about 276.7591819760.

The spelling of 21198548 in words is "twenty-one million, one hundred ninety-eight thousand, five hundred forty-eight".