21114979 has 8 divisors (see below), whose sum is σ = 21611520. Its totient is φ = 20623176.

The previous prime is 21114971. The next prime is 21114991. The reversal of 21114979 is 97941112.

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 21114979 - 2³ = 21114971 is a prime.

It is a super-3 number, since 3×21114979³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21114971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8782 + ... + 10924.

It is an arithmetic number, because the mean of its divisors is an integer number (2701440).

Almost surely, 2^21114979 is an apocalyptic number.

21114979 is a deficient number, since it is larger than the sum of its proper divisors (496541).

21114979 is a wasteful number, since it uses less digits than its factorization.

21114979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369.

The product of its digits is 4536, while the sum is 34.

The square root of 21114979 is about 4595.1038073149. The cubic root of 21114979 is about 276.3950226443.

The spelling of 21114979 in words is "twenty-one million, one hundred fourteen thousand, nine hundred seventy-nine".