21411413 has 4 divisors (see below), whose sum is σ = 22342368. Its totient is φ = 20480460.

The previous prime is 21411407. The next prime is 21411431. The reversal of 21411413 is 31411412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21411413 - 2⁶ = 21411349 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 21411391 and 21411400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465443 + ... + 465488.

It is an arithmetic number, because the mean of its divisors is an integer number (5585592).

Almost surely, 2^21411413 is an apocalyptic number.

21411413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21411413 is a deficient number, since it is larger than the sum of its proper divisors (930955).

21411413 is an equidigital number, since it uses as much as digits as its factorization.

21411413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930954.

The product of its digits is 96, while the sum is 17.

The square root of 21411413 is about 4627.2468056070. The cubic root of 21411413 is about 277.6824566389.

Adding to 21411413 its reverse (31411412), we get a palindrome (52822825).

Subtracting 21411413 from its reverse (31411412), we obtain a palindrome (9999999).

The spelling of 21411413 in words is "twenty-one million, four hundred eleven thousand, four hundred thirteen".