121221020200061 has 2 divisors, whose sum is σ = 121221020200062. Its totient is φ = 121221020200060.

The previous prime is 121221020199953. The next prime is 121221020200069. The reversal of 121221020200061 is 160002020122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119183749271161 + 2037270928900 = 10917131^2 + 1427330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221020200061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221020200069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610510100030 + 60610510100031.

It is an arithmetic number, because the mean of its divisors is an integer number (60610510100031).

Almost surely, 2^{121221020200061} is an apocalyptic number.

It is an amenable number.

121221020200061 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221020200061 is an equidigital number, since it uses as much as digits as its factorization.

121221020200061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 121221020200061 its reverse (160002020122121), we get a palindrome (281223040322182).

The spelling of 121221020200061 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred thousand, sixty-one".