21333222 has 12 divisors (see below), whose sum is σ = 46222020. Its totient is φ = 7111068.

The previous prime is 21333199. The next prime is 21333251. The reversal of 21333222 is 22233312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1185179 = 21333222 / (2 + 1 + 3 + 3 + 3 + 2 + 2 + 2).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21333195 and 21333204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 592572 + ... + 592607.

It is an arithmetic number, because the mean of its divisors is an integer number (3851835).

Almost surely, 2^21333222 is an apocalyptic number.

21333222 is an abundant number, since it is smaller than the sum of its proper divisors (24888798).

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

21333222 is a wasteful number, since it uses less digits than its factorization.

21333222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185187 (or 1185184 counting only the distinct ones).

The product of its digits is 432, while the sum is 18.

The square root of 21333222 is about 4618.7901013144. The cubic root of 21333222 is about 277.3440272755.

Adding to 21333222 its reverse (22233312), we get a palindrome (43566534).

The spelling of 21333222 in words is "twenty-one million, three hundred thirty-three thousand, two hundred twenty-two".