21230222 has 8 divisors (see below), whose sum is σ = 34295016. Its totient is φ = 9798552.

The previous prime is 21230213. The next prime is 21230227. The reversal of 21230222 is 22203212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21230197 and 21230206.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408248 + ... + 408299.

It is an arithmetic number, because the mean of its divisors is an integer number (4286877).

Almost surely, 2^21230222 is an apocalyptic number.

21230222 is a deficient number, since it is larger than the sum of its proper divisors (13064794).

21230222 is a wasteful number, since it uses less digits than its factorization.

21230222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816562.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21230222 is about 4607.6265039606. The cubic root of 21230222 is about 276.8969541163.

Adding to 21230222 its reverse (22203212), we get a palindrome (43433434).

The spelling of 21230222 in words is "twenty-one million, two hundred thirty thousand, two hundred twenty-two".