21041315 has 8 divisors (see below), whose sum is σ = 25347168. Its totient is φ = 16768000.

The previous prime is 21041309. The next prime is 21041353. The reversal of 21041315 is 51314012.

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

It is not a de Polignac number, because 21041315 - 2⁴ = 21041299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21041293 and 21041302.

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, 6686 + ... + 9315.

It is an arithmetic number, because the mean of its divisors is an integer number (3168396).

Almost surely, 2^21041315 is an apocalyptic number.

21041315 is a deficient number, since it is larger than the sum of its proper divisors (4305853).

21041315 is a wasteful number, since it uses less digits than its factorization.

21041315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16269.

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

The square root of 21041315 is about 4587.0813160440. The cubic root of 21041315 is about 276.0732276117.

Adding to 21041315 its reverse (51314012), we get a palindrome (72355327).

The spelling of 21041315 in words is "twenty-one million, forty-one thousand, three hundred fifteen".