111212111201 has 2 divisors, whose sum is σ = 111212111202. Its totient is φ = 111212111200.

The previous prime is 111212111189. The next prime is 111212111207. The reversal of 111212111201 is 102111212111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73007499601 + 38204611600 = 270199^2 + 195460^2 .

It is an emirp because it is prime and its reverse (102111212111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111212111201 - 2⁶ = 111212111137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (111212111207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606055600 + 55606055601.

It is an arithmetic number, because the mean of its divisors is an integer number (55606055601).

Almost surely, 2^111212111201 is an apocalyptic number.

It is an amenable number.

111212111201 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212111201 is an equidigital number, since it uses as much as digits as its factorization.

111212111201 is an evil number, because the sum of its binary digits is even.

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

Adding to 111212111201 its reverse (102111212111), we get a palindrome (213323323312).

The spelling of 111212111201 in words is "one hundred eleven billion, two hundred twelve million, one hundred eleven thousand, two hundred one".