21897098 has 8 divisors (see below), whose sum is σ = 33905280. Its totient is φ = 10595340.

The previous prime is 21897097. The next prime is 21897133. The reversal of 21897098 is 89079812.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21897097) 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 3 ways as a sum of consecutive naturals, for example, 176528 + ... + 176651.

It is an arithmetic number, because the mean of its divisors is an integer number (4238160).

Almost surely, 2^21897098 is an apocalyptic number.

21897098 is a deficient number, since it is larger than the sum of its proper divisors (12008182).

21897098 is a wasteful number, since it uses less digits than its factorization.

21897098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353212.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 21897098 is about 4679.4335127235. The cubic root of 21897098 is about 279.7663782580.

The spelling of 21897098 in words is "twenty-one million, eight hundred ninety-seven thousand, ninety-eight".