21456093 has 4 divisors (see below), whose sum is σ = 28608128. Its totient is φ = 14304060.

The previous prime is 21456089. The next prime is 21456103. The reversal of 21456093 is 39065412.

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 not a de Polignac number, because 21456093 - 2² = 21456089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21456093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21456053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3576013 + ... + 3576018.

It is an arithmetic number, because the mean of its divisors is an integer number (7152032).

Almost surely, 2^21456093 is an apocalyptic number.

It is an amenable number.

21456093 is a deficient number, since it is larger than the sum of its proper divisors (7152035).

21456093 is an equidigital number, since it uses as much as digits as its factorization.

21456093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7152034.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 21456093 is about 4632.0722144630. The cubic root of 21456093 is about 277.8754725818.

The spelling of 21456093 in words is "twenty-one million, four hundred fifty-six thousand, ninety-three".