21224113 has 4 divisors (see below), whose sum is σ = 21391360. Its totient is φ = 21056868.

The previous prime is 21224087. The next prime is 21224123. The reversal of 21224113 is 31142212.

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 21224113 - 2⁵ = 21224081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21224123) 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, 83433 + ... + 83686.

It is an arithmetic number, because the mean of its divisors is an integer number (5347840).

Almost surely, 2^21224113 is an apocalyptic number.

It is an amenable number.

21224113 is a deficient number, since it is larger than the sum of its proper divisors (167247).

21224113 is a wasteful number, since it uses less digits than its factorization.

21224113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167246.

The product of its digits is 96, while the sum is 16.

The square root of 21224113 is about 4606.9635336087. The cubic root of 21224113 is about 276.8703925198.

Adding to 21224113 its reverse (31142212), we get a palindrome (52366325).

The spelling of 21224113 in words is "twenty-one million, two hundred twenty-four thousand, one hundred thirteen".