21303222 has 8 divisors (see below), whose sum is σ = 42606456. Its totient is φ = 7101072.

The previous prime is 21303209. The next prime is 21303229. The reversal of 21303222 is 22230312.

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

21303222 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303229) 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, 1775263 + ... + 1775274.

It is an arithmetic number, because the mean of its divisors is an integer number (5325807).

Almost surely, 2^21303222 is an apocalyptic number.

21303222 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.

21303222 is a wasteful number, since it uses less digits than its factorization.

21303222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3550542.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21303222 is about 4615.5413550308. The cubic root of 21303222 is about 277.2139605961.

Adding to 21303222 its reverse (22230312), we get a palindrome (43533534).

The spelling of 21303222 in words is "twenty-one million, three hundred three thousand, two hundred twenty-two".