21130223 has 8 divisors (see below), whose sum is σ = 22512000. Its totient is φ = 19775448.

The previous prime is 21130111. The next prime is 21130231. The reversal of 21130223 is 32203112.

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 21130223 - 2¹⁸ = 20868079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21130198 and 21130207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130423) 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, 5123 + ... + 8276.

It is an arithmetic number, because the mean of its divisors is an integer number (2814000).

Almost surely, 2^21130223 is an apocalyptic number.

21130223 is a deficient number, since it is larger than the sum of its proper divisors (1381777).

21130223 is a wasteful number, since it uses less digits than its factorization.

21130223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13501.

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

The square root of 21130223 is about 4596.7622300920. The cubic root of 21130223 is about 276.4615212846.

Adding to 21130223 its reverse (32203112), we get a palindrome (53333335).

The spelling of 21130223 in words is "twenty-one million, one hundred thirty thousand, two hundred twenty-three".