21230223 has 32 divisors (see below), whose sum is σ = 33423360. Its totient is φ = 11737440.

The previous prime is 21230213. The next prime is 21230227. The reversal of 21230223 is 32203212.

It is not a de Polignac number, because 21230223 - 2⁶ = 21230159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111058 + ... + 111248.

It is an arithmetic number, because the mean of its divisors is an integer number (1044480).

Almost surely, 2^21230223 is an apocalyptic number.

21230223 is a deficient number, since it is larger than the sum of its proper divisors (12193137).

21230223 is a wasteful number, since it uses less digits than its factorization.

21230223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347.

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

The square root of 21230223 is about 4607.6266124763. The cubic root of 21230223 is about 276.8969584638.

Adding to 21230223 its reverse (32203212), we get a palindrome (53433435).

The spelling of 21230223 in words is "twenty-one million, two hundred thirty thousand, two hundred twenty-three".