21998273 has 8 divisors (see below), whose sum is σ = 24052896. Its totient is φ = 19952800.

The previous prime is 21998267. The next prime is 21998299. The reversal of 21998273 is 37289912.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21998273 - 2¹⁰ = 21997249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21998273.

It is not an unprimeable number, because it can be changed into a prime (21998203) 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, 3365 + ... + 7437.

It is an arithmetic number, because the mean of its divisors is an integer number (3006612).

Almost surely, 2^21998273 is an apocalyptic number.

It is an amenable number.

21998273 is a deficient number, since it is larger than the sum of its proper divisors (2054623).

21998273 is a wasteful number, since it uses less digits than its factorization.

21998273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4575.

The product of its digits is 54432, while the sum is 41.

The square root of 21998273 is about 4690.2316573918. The cubic root of 21998273 is about 280.1966008708.

The spelling of 21998273 in words is "twenty-one million, nine hundred ninety-eight thousand, two hundred seventy-three".