21222130 has 8 divisors (see below), whose sum is σ = 38199852. Its totient is φ = 8488848.

The previous prime is 21222043. The next prime is 21222143. The reversal of 21222130 is 3122212.

It can be written as a sum of positive squares in 2 ways, for example, as 20548089 + 674041 = 4533^2 + 821^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21222130.

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, 1061097 + ... + 1061116.

Almost surely, 2^21222130 is an apocalyptic number.

21222130 is a deficient number, since it is larger than the sum of its proper divisors (16977722).

21222130 is a wasteful number, since it uses less digits than its factorization.

21222130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122220.

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

The square root of 21222130 is about 4606.7483109022. The cubic root of 21222130 is about 276.8617694490.

Adding to 21222130 its reverse (3122212), we get a palindrome (24344342).

The spelling of 21222130 in words is "twenty-one million, two hundred twenty-two thousand, one hundred thirty".