121230203231261 has 2 divisors, whose sum is σ = 121230203231262. Its totient is φ = 121230203231260.

The previous prime is 121230203231209. The next prime is 121230203231321. The reversal of 121230203231261 is 162132302032121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117672052905625 + 3558150325636 = 10847675^2 + 1886306^2 .

It is a cyclic number.

It is not a de Polignac number, because 121230203231261 - 2¹⁰ = 121230203230237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121230503231261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60615101615630 + 60615101615631.

It is an arithmetic number, because the mean of its divisors is an integer number (60615101615631).

Almost surely, 2^{121230203231261} is an apocalyptic number.

It is an amenable number.

121230203231261 is a deficient number, since it is larger than the sum of its proper divisors (1).

121230203231261 is an equidigital number, since it uses as much as digits as its factorization.

121230203231261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 121230203231261 its reverse (162132302032121), we get a palindrome (283362505263382).

The spelling of 121230203231261 in words is "one hundred twenty-one trillion, two hundred thirty billion, two hundred three million, two hundred thirty-one thousand, two hundred sixty-one".