21147198 has 16 divisors (see below), whose sum is σ = 42474240. Its totient is φ = 7019096.

The previous prime is 21147197. The next prime is 21147211. The reversal of 21147198 is 89174112.

It is a super-3 number, since 3×21147198³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147197) by changing a digit.

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, 5940 + ... + 8807.

It is an arithmetic number, because the mean of its divisors is an integer number (2654640).

Almost surely, 2^21147198 is an apocalyptic number.

21147198 is an abundant number, since it is smaller than the sum of its proper divisors (21327042).

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

21147198 is a wasteful number, since it uses less digits than its factorization.

21147198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14991.

The product of its digits is 4032, while the sum is 33.

The square root of 21147198 is about 4598.6082677262. The cubic root of 21147198 is about 276.5355334108.

The spelling of 21147198 in words is "twenty-one million, one hundred forty-seven thousand, one hundred ninety-eight".