21104415 has 16 divisors (see below), whose sum is σ = 37519200. Its totient is φ = 11255616.

The previous prime is 21104407. The next prime is 21104453. The reversal of 21104415 is 51440112.

It is not a de Polignac number, because 21104415 - 2³ = 21104407 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78030 + ... + 78299.

It is an arithmetic number, because the mean of its divisors is an integer number (2344950).

Almost surely, 2^21104415 is an apocalyptic number.

21104415 is a deficient number, since it is larger than the sum of its proper divisors (16414785).

21104415 is a wasteful number, since it uses less digits than its factorization.

21104415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156343 (or 156337 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 21104415 is about 4593.9541791359. The cubic root of 21104415 is about 276.3489207104.

Adding to 21104415 its reverse (51440112), we get a palindrome (72544527).

The spelling of 21104415 in words is "twenty-one million, one hundred four thousand, four hundred fifteen".