1121212202161 has 2 divisors, whose sum is σ = 1121212202162. Its totient is φ = 1121212202160.

The previous prime is 1121212202119. The next prime is 1121212202171. The reversal of 1121212202161 is 1612022121211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 869474191936 + 251738010225 = 932456^2 + 501735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121212202161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121212202171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560606101080 + 560606101081.

It is an arithmetic number, because the mean of its divisors is an integer number (560606101081).

Almost surely, 2^{1121212202161} is an apocalyptic number.

It is an amenable number.

1121212202161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121212202161 is an equidigital number, since it uses as much as digits as its factorization.

1121212202161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 1121212202161 its reverse (1612022121211), we get a palindrome (2733234323372).

The spelling of 1121212202161 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred two thousand, one hundred sixty-one".