21302223 has 8 divisors (see below), whose sum is σ = 28425600. Its totient is φ = 14190168.

The previous prime is 21302221. The next prime is 21302227. The reversal of 21302223 is 32220312.

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

It is not a de Polignac number, because 21302223 - 2¹ = 21302221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302221) 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 7 ways as a sum of consecutive naturals, for example, 3748 + ... + 7526.

It is an arithmetic number, because the mean of its divisors is an integer number (3553200).

Almost surely, 2^21302223 is an apocalyptic number.

21302223 is a deficient number, since it is larger than the sum of its proper divisors (7123377).

21302223 is a wasteful number, since it uses less digits than its factorization.

21302223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5661.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21302223 is about 4615.4331324373. The cubic root of 21302223 is about 277.2096272755.

Adding to 21302223 its reverse (32220312), we get a palindrome (53522535).

The spelling of 21302223 in words is "twenty-one million, three hundred two thousand, two hundred twenty-three".