211211222 has 4 divisors (see below), whose sum is σ = 316816836. Its totient is φ = 105605610.

The previous prime is 211211191. The next prime is 211211243. The reversal of 211211222 is 222112112.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×211211222² = 89220360597466568, which contains 22 as substring.

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 = 211211197 and 211211206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52802804 + ... + 52802807.

It is an arithmetic number, because the mean of its divisors is an integer number (79204209).

Almost surely, 2^211211222 is an apocalyptic number.

211211222 is a deficient number, since it is larger than the sum of its proper divisors (105605614).

211211222 is a wasteful number, since it uses less digits than its factorization.

211211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105605613.

The product of its digits is 32, while the sum is 14.

The square root of 211211222 is about 14533.1077887698. The cubic root of 211211222 is about 595.5327685805.

Adding to 211211222 its reverse (222112112), we get a palindrome (433323334).

It can be divided in two parts, 2112112 and 22, that multiplied together give a palindrome (46466464).

The spelling of 211211222 in words is "two hundred eleven million, two hundred eleven thousand, two hundred twenty-two".