111212001217 has 2 divisors, whose sum is σ = 111212001218. Its totient is φ = 111212001216.

The previous prime is 111212001203. The next prime is 111212001227. The reversal of 111212001217 is 712100212111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67979611441 + 43232389776 = 260729^2 + 207924^2 .

It is an emirp because it is prime and its reverse (712100212111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111212001217 - 2¹¹ = 111211999169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111212001194 and 111212001203.

It is not a weakly prime, because it can be changed into another prime (111212001227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606000608 + 55606000609.

It is an arithmetic number, because the mean of its divisors is an integer number (55606000609).

Almost surely, 2^111212001217 is an apocalyptic number.

It is an amenable number.

111212001217 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212001217 is an equidigital number, since it uses as much as digits as its factorization.

111212001217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 111212001217 its reverse (712100212111), we get a palindrome (823312213328).

The spelling of 111212001217 in words is "one hundred eleven billion, two hundred twelve million, one thousand, two hundred seventeen".