1220211101111 has 4 divisors (see below), whose sum is σ = 1220322010152. Its totient is φ = 1220100192072.

The previous prime is 1220211101077. The next prime is 1220211101141. The reversal of 1220211101111 is 1111011120221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220211101111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220211101141) 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, 55438016 + ... + 55460021.

It is an arithmetic number, because the mean of its divisors is an integer number (305080502538).

Almost surely, 2^{1220211101111} is an apocalyptic number.

1220211101111 is a deficient number, since it is larger than the sum of its proper divisors (110909041).

1220211101111 is a wasteful number, since it uses less digits than its factorization.

1220211101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110909040.

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

Adding to 1220211101111 its reverse (1111011120221), we get a palindrome (2331222221332).

The spelling of 1220211101111 in words is "one trillion, two hundred twenty billion, two hundred eleven million, one hundred one thousand, one hundred eleven".