21104315 has 8 divisors (see below), whose sum is σ = 26198640. Its totient is φ = 16301152.

The previous prime is 21104311. The next prime is 21104323. The reversal of 21104315 is 51340112.

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 21104315 - 2² = 21104311 is a prime.

It is a super-2 number, since 2×21104315² = 890784223238450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21104293 and 21104302.

It is not an unprimeable number, because it can be changed into a prime (21104311) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 72629 + ... + 72918.

It is an arithmetic number, because the mean of its divisors is an integer number (3274830).

Almost surely, 2^21104315 is an apocalyptic number.

21104315 is a deficient number, since it is larger than the sum of its proper divisors (5094325).

21104315 is a wasteful number, since it uses less digits than its factorization.

21104315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145581.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21104315 is about 4593.9432952530. The cubic root of 21104315 is about 276.3484842309.

Adding to 21104315 its reverse (51340112), we get a palindrome (72444427).

The spelling of 21104315 in words is "twenty-one million, one hundred four thousand, three hundred fifteen".