111020221217 has 2 divisors, whose sum is σ = 111020221218. Its totient is φ = 111020221216.

The previous prime is 111020221183. The next prime is 111020221237. The reversal of 111020221217 is 712122020111.

It is a happy number.

It is an a-pointer prime, because the next prime (111020221237) can be obtained adding 111020221217 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89319690496 + 21700530721 = 298864^2 + 147311^2 .

It is a cyclic number.

It is not a de Polignac number, because 111020221217 - 2¹⁸ = 111019959073 is a prime.

It is a super-2 number, since 2×111020221217² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111020221237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510110608 + 55510110609.

It is an arithmetic number, because the mean of its divisors is an integer number (55510110609).

Almost surely, 2^111020221217 is an apocalyptic number.

It is an amenable number.

111020221217 is a deficient number, since it is larger than the sum of its proper divisors (1).

111020221217 is an equidigital number, since it uses as much as digits as its factorization.

111020221217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 111020221217 its reverse (712122020111), we get a palindrome (823142241328).

The spelling of 111020221217 in words is "one hundred eleven billion, twenty million, two hundred twenty-one thousand, two hundred seventeen".