21003222 has 8 divisors (see below), whose sum is σ = 42006456. Its totient is φ = 7001072.

The previous prime is 21003179. The next prime is 21003223. The reversal of 21003222 is 22230012.

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

21003222 is an admirable number.

It is a super-2 number, since 2×21003222² = 882270668762568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003198 and 21003207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003223) 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, 1750263 + ... + 1750274.

It is an arithmetic number, because the mean of its divisors is an integer number (5250807).

Almost surely, 2^21003222 is an apocalyptic number.

21003222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21003222 is a wasteful number, since it uses less digits than its factorization.

21003222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500542.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21003222 is about 4582.9272304936. The cubic root of 21003222 is about 275.9065268431.

Adding to 21003222 its reverse (22230012), we get a palindrome (43233234).

The spelling of 21003222 in words is "twenty-one million, three thousand, two hundred twenty-two".