21411313 has 24 divisors (see below), whose sum is σ = 28498176. Its totient is φ = 15692160.

The previous prime is 21411301. The next prime is 21411317. The reversal of 21411313 is 31311412.

It is not a de Polignac number, because 21411313 - 2⁵ = 21411281 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 23 ways as a sum of consecutive naturals, for example, 13656 + ... + 15142.

It is an arithmetic number, because the mean of its divisors is an integer number (1187424).

Almost surely, 2^21411313 is an apocalyptic number.

It is an amenable number.

21411313 is a deficient number, since it is larger than the sum of its proper divisors (7086863).

21411313 is a wasteful number, since it uses less digits than its factorization.

21411313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533 (or 1522 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 21411313 is about 4627.2360000328. The cubic root of 21411313 is about 277.6820243416.

Adding to 21411313 its reverse (31311412), we get a palindrome (52722725).

Subtracting 21411313 from its reverse (31311412), we obtain a palindrome (9900099).

The spelling of 21411313 in words is "twenty-one million, four hundred eleven thousand, three hundred thirteen".