21411393 has 4 divisors (see below), whose sum is σ = 28548528. Its totient is φ = 14274260.

The previous prime is 21411361. The next prime is 21411407. The reversal of 21411393 is 39311412.

21411393 is nontrivially palindromic in base 16.

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 21411393 - 2⁵ = 21411361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21411343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3568563 + ... + 3568568.

It is an arithmetic number, because the mean of its divisors is an integer number (7137132).

Almost surely, 2^21411393 is an apocalyptic number.

It is an amenable number.

21411393 is a deficient number, since it is larger than the sum of its proper divisors (7137135).

21411393 is an equidigital number, since it uses as much as digits as its factorization.

21411393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7137134.

The product of its digits is 648, while the sum is 24.

The square root of 21411393 is about 4627.2446444942. The cubic root of 21411393 is about 277.6823701795.

The spelling of 21411393 in words is "twenty-one million, four hundred eleven thousand, three hundred ninety-three".