21211222 has 8 divisors (see below), whose sum is σ = 31849272. Its totient is φ = 10594800.

The previous prime is 21211217. The next prime is 21211237. The reversal of 21211222 is 22211212.

It is a happy number.

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

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

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 3 ways as a sum of consecutive naturals, for example, 2679 + ... + 7042.

It is an arithmetic number, because the mean of its divisors is an integer number (3981159).

Almost surely, 2^21211222 is an apocalyptic number.

21211222 is a deficient number, since it is larger than the sum of its proper divisors (10638050).

21211222 is a wasteful number, since it uses less digits than its factorization.

21211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10814.

The product of its digits is 32, while the sum is 13.

The square root of 21211222 is about 4605.5642433908. The cubic root of 21211222 is about 276.8143264300.

Adding to 21211222 its reverse (22211212), we get a palindrome (43422434).

The spelling of 21211222 in words is "twenty-one million, two hundred eleven thousand, two hundred twenty-two".