21410109 has 24 divisors (see below), whose sum is σ = 36899520. Its totient is φ = 12233592.

The previous prime is 21410063. The next prime is 21410111. The reversal of 21410109 is 90101412.

It is not a de Polignac number, because 21410109 - 2²⁰ = 20361533 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21410091 and 21410100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21410189) 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 23 ways as a sum of consecutive naturals, for example, 6769 + ... + 9414.

It is an arithmetic number, because the mean of its divisors is an integer number (1537480).

Almost surely, 2^21410109 is an apocalyptic number.

It is an amenable number.

21410109 is a deficient number, since it is larger than the sum of its proper divisors (15489411).

21410109 is a wasteful number, since it uses less digits than its factorization.

21410109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16206 (or 16193 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 21410109 is about 4627.1058989394. The cubic root of 21410109 is about 277.6768193763.

The spelling of 21410109 in words is "twenty-one million, four hundred ten thousand, one hundred nine".