1222221211 has 8 divisors (see below), whose sum is σ = 1264758480. Its totient is φ = 1179710112.

The previous prime is 1222221197. The next prime is 1222221233. The reversal of 1222221211 is 1121222221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1222221211 - 2⁷ = 1222221083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222227211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165841 + ... + 173053.

It is an arithmetic number, because the mean of its divisors is an integer number (158094810).

Almost surely, 2^1222221211 is an apocalyptic number.

1222221211 is a deficient number, since it is larger than the sum of its proper divisors (42537269).

1222221211 is an equidigital number, since it uses as much as digits as its factorization.

1222221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13085.

The product of its digits is 64, while the sum is 16.

The square root of 1222221211 is about 34960.2804765637. The cubic root of 1222221211 is about 1069.1778151322.

Adding to 1222221211 its reverse (1121222221), we get a palindrome (2343443432).

It can be divided in two parts, 12222 and 21211, that added together give a palindrome (33433).

The spelling of 1222221211 in words is "one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred eleven".