21344853 has 4 divisors (see below), whose sum is σ = 28459808. Its totient is φ = 14229900.

The previous prime is 21344839. The next prime is 21344857. The reversal of 21344853 is 35844312.

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 21344853 - 2⁵ = 21344821 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 21344853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344857) 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, 3557473 + ... + 3557478.

It is an arithmetic number, because the mean of its divisors is an integer number (7114952).

Almost surely, 2^21344853 is an apocalyptic number.

It is an amenable number.

21344853 is a deficient number, since it is larger than the sum of its proper divisors (7114955).

21344853 is an equidigital number, since it uses as much as digits as its factorization.

21344853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7114954.

The product of its digits is 11520, while the sum is 30.

The square root of 21344853 is about 4620.0490257139. The cubic root of 21344853 is about 277.3944213248.

The spelling of 21344853 in words is "twenty-one million, three hundred forty-four thousand, eight hundred fifty-three".