111201202121 has 2 divisors, whose sum is σ = 111201202122. Its totient is φ = 111201202120.

The previous prime is 111201202103. The next prime is 111201202127. The reversal of 111201202121 is 121202102111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80273055625 + 30928146496 = 283325^2 + 175864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111201202121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111201202096 and 111201202105.

It is not a weakly prime, because it can be changed into another prime (111201202127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55600601060 + 55600601061.

It is an arithmetic number, because the mean of its divisors is an integer number (55600601061).

Almost surely, 2^111201202121 is an apocalyptic number.

It is an amenable number.

111201202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111201202121 is an equidigital number, since it uses as much as digits as its factorization.

111201202121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111201202121 its reverse (121202102111), we get a palindrome (232403304232).

The spelling of 111201202121 in words is "one hundred eleven billion, two hundred one million, two hundred two thousand, one hundred twenty-one".