21107869 has 8 divisors (see below), whose sum is σ = 21862400. Its totient is φ = 20358000.

The previous prime is 21107861. The next prime is 21107909. The reversal of 21107869 is 96870112.

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 21107869 - 2³ = 21107861 is a prime.

It is a super-3 number, since 3×21107869³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21107861) 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, 9844 + ... + 11794.

It is an arithmetic number, because the mean of its divisors is an integer number (2732800).

Almost surely, 2^21107869 is an apocalyptic number.

It is an amenable number.

21107869 is a deficient number, since it is larger than the sum of its proper divisors (754531).

21107869 is a wasteful number, since it uses less digits than its factorization.

21107869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 21107869 is about 4594.3300926250. The cubic root of 21107869 is about 276.3639958674.

The spelling of 21107869 in words is "twenty-one million, one hundred seven thousand, eight hundred sixty-nine".