111111011220101 has 2 divisors, whose sum is σ = 111111011220102. Its totient is φ = 111111011220100.

The previous prime is 111111011220073. The next prime is 111111011220137. The reversal of 111111011220101 is 101022110111111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73013094352900 + 38097916867201 = 8544770^2 + 6172351^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111011220101 - 2⁶ = 111111011220037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111011220161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555505610050 + 55555505610051.

It is an arithmetic number, because the mean of its divisors is an integer number (55555505610051).

Almost surely, 2^{111111011220101} is an apocalyptic number.

It is an amenable number.

111111011220101 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111011220101 is an equidigital number, since it uses as much as digits as its factorization.

111111011220101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 111111011220101 its reverse (101022110111111), we get a palindrome (212133121331212).

The spelling of 111111011220101 in words is "one hundred eleven trillion, one hundred eleven billion, eleven million, two hundred twenty thousand, one hundred one".