21222230 has 16 divisors (see below), whose sum is σ = 38372400. Its totient is φ = 8450592.

The previous prime is 21222211. The next prime is 21222251. The reversal of 21222230 is 3222212.

It is a congruent number.

It is an unprimeable number.

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, 2405 + ... + 6944.

It is an arithmetic number, because the mean of its divisors is an integer number (2398275).

Almost surely, 2^21222230 is an apocalyptic number.

21222230 is a deficient number, since it is larger than the sum of its proper divisors (17150170).

21222230 is a wasteful number, since it uses less digits than its factorization.

21222230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9583.

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

The square root of 21222230 is about 4606.7591645320. The cubic root of 21222230 is about 276.8622043116.

Adding to 21222230 its reverse (3222212), we get a palindrome (24444442).

The spelling of 21222230 in words is "twenty-one million, two hundred twenty-two thousand, two hundred thirty".