211220222 has 4 divisors (see below), whose sum is σ = 316830336. Its totient is φ = 105610110.

The previous prime is 211220153. The next prime is 211220231. The reversal of 211220222 is 222022112.

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

It is a super-2 number, since 2×211220222² = 89227964363458568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211220197 and 211220206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52805054 + ... + 52805057.

It is an arithmetic number, because the mean of its divisors is an integer number (79207584).

Almost surely, 2^211220222 is an apocalyptic number.

211220222 is a deficient number, since it is larger than the sum of its proper divisors (105610114).

211220222 is a wasteful number, since it uses less digits than its factorization.

211220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105610113.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 211220222 is about 14533.4174233041. The cubic root of 211220222 is about 595.5412272832.

Adding to 211220222 its reverse (222022112), we get a palindrome (433242334).

The spelling of 211220222 in words is "two hundred eleven million, two hundred twenty thousand, two hundred twenty-two".