21301223 has 8 divisors (see below), whose sum is σ = 22467120. Its totient is φ = 20139840.

The previous prime is 21301219. The next prime is 21301229. The reversal of 21301223 is 32210312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21301223 - 2² = 21301219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21301198 and 21301207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301229) 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, 13643 + ... + 15123.

It is an arithmetic number, because the mean of its divisors is an integer number (2808390).

Almost surely, 2^21301223 is an apocalyptic number.

21301223 is a deficient number, since it is larger than the sum of its proper divisors (1165897).

21301223 is a wasteful number, since it uses less digits than its factorization.

21301223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21301223 is about 4615.3247989714. The cubic root of 21301223 is about 277.2052894815.

Adding to 21301223 its reverse (32210312), we get a palindrome (53511535).

The spelling of 21301223 in words is "twenty-one million, three hundred one thousand, two hundred twenty-three".