121508588261 has 2 divisors, whose sum is σ = 121508588262. Its totient is φ = 121508588260.

The previous prime is 121508588177. The next prime is 121508588297. The reversal of 121508588261 is 162885805121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118731930625 + 2776657636 = 344575^2 + 52694^2 .

It is a cyclic number.

It is not a de Polignac number, because 121508588261 - 2³⁰ = 120434846437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121508548261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60754294130 + 60754294131.

It is an arithmetic number, because the mean of its divisors is an integer number (60754294131).

Almost surely, 2^121508588261 is an apocalyptic number.

It is an amenable number.

121508588261 is a deficient number, since it is larger than the sum of its proper divisors (1).

121508588261 is an equidigital number, since it uses as much as digits as its factorization.

121508588261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 307200, while the sum is 47.

The spelling of 121508588261 in words is "one hundred twenty-one billion, five hundred eight million, five hundred eighty-eight thousand, two hundred sixty-one".