111211200072121 has 2 divisors, whose sum is σ = 111211200072122. Its totient is φ = 111211200072120.

The previous prime is 111211200072107. The next prime is 111211200072169. The reversal of 111211200072121 is 121270002112111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110728036062121 + 483164010000 = 10522739^2 + 695100^2 .

It is an emirp because it is prime and its reverse (121270002112111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111211200072121 - 2¹¹ = 111211200070073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111211200072092 and 111211200072101.

It is not a weakly prime, because it can be changed into another prime (111211200072821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605600036060 + 55605600036061.

It is an arithmetic number, because the mean of its divisors is an integer number (55605600036061).

Almost surely, 2^{111211200072121} is an apocalyptic number.

It is an amenable number.

111211200072121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211200072121 is an equidigital number, since it uses as much as digits as its factorization.

111211200072121 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 22.

Adding to 111211200072121 its reverse (121270002112111), we get a palindrome (232481202184232).

The spelling of 111211200072121 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred million, seventy-two thousand, one hundred twenty-one".