1220111011211 has 4 divisors (see below), whose sum is σ = 1220123263752. Its totient is φ = 1220098758672.

The previous prime is 1220111011199. The next prime is 1220111011241. The reversal of 1220111011211 is 1121101110221.

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 1220111011211 - 2¹⁰ = 1220111010187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220111011241) 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, 5975666 + ... + 6176471.

It is an arithmetic number, because the mean of its divisors is an integer number (305030815938).

Almost surely, 2^{1220111011211} is an apocalyptic number.

1220111011211 is a deficient number, since it is larger than the sum of its proper divisors (12252541).

1220111011211 is a wasteful number, since it uses less digits than its factorization.

1220111011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12252540.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1220111011211 its reverse (1121101110221), we get a palindrome (2341212121432).

The spelling of 1220111011211 in words is "one trillion, two hundred twenty billion, one hundred eleven million, eleven thousand, two hundred eleven".