21198353 has 12 divisors (see below), whose sum is σ = 23874564. Its totient is φ = 18796800.

The previous prime is 21198349. The next prime is 21198367. The reversal of 21198353 is 35389112.

It can be written as a sum of positive squares in 2 ways, for example, as 2982529 + 18215824 = 1727^2 + 4268^2 .

It is not a de Polignac number, because 21198353 - 2² = 21198349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21198343) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2825 + ... + 7097.

It is an arithmetic number, because the mean of its divisors is an integer number (1989547).

Almost surely, 2^21198353 is an apocalyptic number.

It is an amenable number.

21198353 is a deficient number, since it is larger than the sum of its proper divisors (2676211).

21198353 is a wasteful number, since it uses less digits than its factorization.

21198353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4336 (or 4325 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 21198353 is about 4604.1669170437. The cubic root of 21198353 is about 276.7583333612.

The spelling of 21198353 in words is "twenty-one million, one hundred ninety-eight thousand, three hundred fifty-three".