21258898 has 8 divisors (see below), whose sum is σ = 31908492. Its totient is φ = 10622736.

The previous prime is 21258871. The next prime is 21258907. The reversal of 21258898 is 89885212.

It can be written as a sum of positive squares in 2 ways, for example, as 21187609 + 71289 = 4603^2 + 267^2 .

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

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, 3036 + ... + 7192.

Almost surely, 2^21258898 is an apocalyptic number.

21258898 is a deficient number, since it is larger than the sum of its proper divisors (10649594).

21258898 is a wasteful number, since it uses less digits than its factorization.

21258898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6716.

The product of its digits is 92160, while the sum is 43.

The square root of 21258898 is about 4610.7372512430. The cubic root of 21258898 is about 277.0215677403.

The spelling of 21258898 in words is "twenty-one million, two hundred fifty-eight thousand, eight hundred ninety-eight".