1220011211111 has 16 divisors (see below), whose sum is σ = 1521398350080. Its totient is φ = 950442204480.

The previous prime is 1220011211093. The next prime is 1220011211131. The reversal of 1220011211111 is 1111121100221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220011211111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220011211131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1457321 + ... + 2136306.

It is an arithmetic number, because the mean of its divisors is an integer number (95087396880).

Almost surely, 2^{1220011211111} is an apocalyptic number.

1220011211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220011211111 is a deficient number, since it is larger than the sum of its proper divisors (301387138969).

1220011211111 is a wasteful number, since it uses less digits than its factorization.

1220011211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3598054.

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

Adding to 1220011211111 its reverse (1111121100221), we get a palindrome (2331132311332).

The spelling of 1220011211111 in words is "one trillion, two hundred twenty billion, eleven million, two hundred eleven thousand, one hundred eleven".