1220222211211 has 4 divisors (see below), whose sum is σ = 1220725813392. Its totient is φ = 1219718609032.

The previous prime is 1220222211209. The next prime is 1220222211251. The reversal of 1220222211211 is 1121122220221.

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 1220222211211 - 2¹ = 1220222211209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220222211251) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 251797456 + ... + 251802301.

It is an arithmetic number, because the mean of its divisors is an integer number (305181453348).

Almost surely, 2^{1220222211211} is an apocalyptic number.

1220222211211 is a deficient number, since it is larger than the sum of its proper divisors (503602181).

1220222211211 is an equidigital number, since it uses as much as digits as its factorization.

1220222211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503602180.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1220222211211 its reverse (1121122220221), we get a palindrome (2341344431432).

The spelling of 1220222211211 in words is "one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred eleven thousand, two hundred eleven".