111101011101221 has 2 divisors, whose sum is σ = 111101011101222. Its totient is φ = 111101011101220.

The previous prime is 111101011101187. The next prime is 111101011101239. The reversal of 111101011101221 is 122101110101111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101318034650596 + 9782976450625 = 10065686^2 + 3127775^2 .

It is an emirp because it is prime and its reverse (122101110101111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111101011101221 - 2¹⁰ = 111101011100197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111101011101196 and 111101011101205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111101011106221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550505550610 + 55550505550611.

It is an arithmetic number, because the mean of its divisors is an integer number (55550505550611).

Almost surely, 2^{111101011101221} is an apocalyptic number.

It is an amenable number.

111101011101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111101011101221 is an equidigital number, since it uses as much as digits as its factorization.

111101011101221 is an evil number, because the sum of its binary digits is even.

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

Adding to 111101011101221 its reverse (122101110101111), we get a palindrome (233202121202332).

The spelling of 111101011101221 in words is "one hundred eleven trillion, one hundred one billion, eleven million, one hundred one thousand, two hundred twenty-one".