21473198 has 8 divisors (see below), whose sum is σ = 32390280. Its totient is φ = 10676440.

The previous prime is 21473171. The next prime is 21473201. The reversal of 21473198 is 89137412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21473198² = 922196464694408, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29633 + ... + 30348.

It is an arithmetic number, because the mean of its divisors is an integer number (4048785).

Almost surely, 2^21473198 is an apocalyptic number.

21473198 is a deficient number, since it is larger than the sum of its proper divisors (10917082).

21473198 is a wasteful number, since it uses less digits than its factorization.

21473198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60162.

The product of its digits is 12096, while the sum is 35.

The square root of 21473198 is about 4633.9182124850. The cubic root of 21473198 is about 277.9492946185.

The spelling of 21473198 in words is "twenty-one million, four hundred seventy-three thousand, one hundred ninety-eight".