1220111010211 has 4 divisors (see below), whose sum is σ = 1220227476832. Its totient is φ = 1219994543592.

The previous prime is 1220111010187. The next prime is 1220111010299. The reversal of 1220111010211 is 1120101110221.

It is a happy number.

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 1220111010211 - 2¹¹ = 1220111008163 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220111010191 and 1220111010200.

It is not an unprimeable number, because it can be changed into a prime (1220111010611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58217595 + ... + 58238548.

It is an arithmetic number, because the mean of its divisors is an integer number (305056869208).

Almost surely, 2^{1220111010211} is an apocalyptic number.

1220111010211 is a deficient number, since it is larger than the sum of its proper divisors (116466621).

1220111010211 is a wasteful number, since it uses less digits than its factorization.

1220111010211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116466620.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1220111010211 its reverse (1120101110221), we get a palindrome (2340212120432).

The spelling of 1220111010211 in words is "one trillion, two hundred twenty billion, one hundred eleven million, ten thousand, two hundred eleven".