21222310 has 8 divisors (see below), whose sum is σ = 38200176. Its totient is φ = 8488920.

The previous prime is 21222293. The next prime is 21222343. The reversal of 21222310 is 1322212.

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

It is a super-2 number, since 2×21222310² = 900772883472200, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1061106 + ... + 1061125.

It is an arithmetic number, because the mean of its divisors is an integer number (4775022).

Almost surely, 2^21222310 is an apocalyptic number.

21222310 is a deficient number, since it is larger than the sum of its proper divisors (16977866).

21222310 is a wasteful number, since it uses less digits than its factorization.

21222310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122238.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21222310 is about 4606.7678474175. The cubic root of 21222310 is about 276.8625522007.

Adding to 21222310 its reverse (1322212), we get a palindrome (22544522).

It can be divided in two parts, 212 and 22310, that added together give a palindrome (22522).

The spelling of 21222310 in words is "twenty-one million, two hundred twenty-two thousand, three hundred ten".