1211222219 has 4 divisors (see below), whose sum is σ = 1223709144. Its totient is φ = 1198735296.

The previous prime is 1211222213. The next prime is 1211222227. The reversal of 1211222219 is 9122221121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211222219 - 2²⁸ = 942786763 is a prime.

It is a super-2 number, since 2×1211222219² = 2934118527598567922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211222194 and 1211222203.

It is not an unprimeable number, because it can be changed into a prime (1211222213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6243317 + ... + 6243510.

It is an arithmetic number, because the mean of its divisors is an integer number (305927286).

Almost surely, 2^1211222219 is an apocalyptic number.

1211222219 is a deficient number, since it is larger than the sum of its proper divisors (12486925).

1211222219 is an equidigital number, since it uses as much as digits as its factorization.

1211222219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12486924.

The product of its digits is 288, while the sum is 23.

The square root of 1211222219 is about 34802.6179906052. The cubic root of 1211222219 is about 1065.9609037168.

The spelling of 1211222219 in words is "one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred nineteen".