121002011261 has 2 divisors, whose sum is σ = 121002011262. Its totient is φ = 121002011260.

The previous prime is 121002011237. The next prime is 121002011399. The reversal of 121002011261 is 162110200121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74600543161 + 46401468100 = 273131^2 + 215410^2 .

It is a cyclic number.

It is not a de Polignac number, because 121002011261 - 2⁶ = 121002011197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121002011561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60501005630 + 60501005631.

It is an arithmetic number, because the mean of its divisors is an integer number (60501005631).

Almost surely, 2^121002011261 is an apocalyptic number.

It is an amenable number.

121002011261 is a deficient number, since it is larger than the sum of its proper divisors (1).

121002011261 is an equidigital number, since it uses as much as digits as its factorization.

121002011261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121002011261 its reverse (162110200121), we get a palindrome (283112211382).

The spelling of 121002011261 in words is "one hundred twenty-one billion, two million, eleven thousand, two hundred sixty-one".