21411315 has 12 divisors (see below), whose sum is σ = 37113024. Its totient is φ = 11419344.

The previous prime is 21411301. The next prime is 21411317. The reversal of 21411315 is 51311412.

It is not a de Polignac number, because 21411315 - 2⁸ = 21411059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21411317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237859 + ... + 237948.

It is an arithmetic number, because the mean of its divisors is an integer number (3092752).

Almost surely, 2^21411315 is an apocalyptic number.

21411315 is a deficient number, since it is larger than the sum of its proper divisors (15701709).

21411315 is a wasteful number, since it uses less digits than its factorization.

21411315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475818 (or 475815 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 21411315 is about 4627.2362161446. The cubic root of 21411315 is about 277.6820329875.

Adding to 21411315 its reverse (51311412), we get a palindrome (72722727).

The spelling of 21411315 in words is "twenty-one million, four hundred eleven thousand, three hundred fifteen".