21415105 has 8 divisors (see below), whose sum is σ = 25774272. Its totient is φ = 17081328.

The previous prime is 21415099. The next prime is 21415129. The reversal of 21415105 is 50151412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21415105 is a prime.

It is a super-3 number, since 3×21415105³ (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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4437 + ... + 7906.

It is an arithmetic number, because the mean of its divisors is an integer number (3221784).

Almost surely, 2^21415105 is an apocalyptic number.

It is an amenable number.

21415105 is a deficient number, since it is larger than the sum of its proper divisors (4359167).

21415105 is a wasteful number, since it uses less digits than its factorization.

21415105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12695.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 21415105 is about 4627.6457297421. The cubic root of 21415105 is about 277.6984161136.

Adding to 21415105 its reverse (50151412), we get a palindrome (71566517).

The spelling of 21415105 in words is "twenty-one million, four hundred fifteen thousand, one hundred five".