21113223 has 8 divisors (see below), whose sum is σ = 28182000. Its totient is φ = 14059968.

The previous prime is 21113221. The next prime is 21113231. The reversal of 21113223 is 32231112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21113223 - 2¹ = 21113221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208 + ... + 6501.

It is an arithmetic number, because the mean of its divisors is an integer number (3522750).

Almost surely, 2^21113223 is an apocalyptic number.

21113223 is a deficient number, since it is larger than the sum of its proper divisors (7068777).

21113223 is a wasteful number, since it uses less digits than its factorization.

21113223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7761.

The product of its digits is 72, while the sum is 15.

The square root of 21113223 is about 4594.9127304009. The cubic root of 21113223 is about 276.3873604200.

Adding to 21113223 its reverse (32231112), we get a palindrome (53344335).

The spelling of 21113223 in words is "twenty-one million, one hundred thirteen thousand, two hundred twenty-three".