21113279 has 8 divisors (see below), whose sum is σ = 23349072. Its totient is φ = 18930240.

The previous prime is 21113251. The next prime is 21113297. The reversal of 21113279 is 97231112.

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 21113279 - 2⁸ = 21113023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113299) 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, 12344 + ... + 13949.

It is an arithmetic number, because the mean of its divisors is an integer number (2918634).

Almost surely, 2^21113279 is an apocalyptic number.

21113279 is a deficient number, since it is larger than the sum of its proper divisors (2235793).

21113279 is a wasteful number, since it uses less digits than its factorization.

21113279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26377.

The product of its digits is 756, while the sum is 26.

The square root of 21113279 is about 4594.9188240925. The cubic root of 21113279 is about 276.3876047799.

The spelling of 21113279 in words is "twenty-one million, one hundred thirteen thousand, two hundred seventy-nine".