121298917777 has 2 divisors, whose sum is σ = 121298917778. Its totient is φ = 121298917776.

The previous prime is 121298917757. The next prime is 121298917801. The reversal of 121298917777 is 777719892121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93190383441 + 28108534336 = 305271^2 + 167656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121298917777 is a prime.

It is not a weakly prime, because it can be changed into another prime (121298917717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60649458888 + 60649458889.

It is an arithmetic number, because the mean of its divisors is an integer number (60649458889).

Almost surely, 2^121298917777 is an apocalyptic number.

It is an amenable number.

121298917777 is a deficient number, since it is larger than the sum of its proper divisors (1).

121298917777 is an equidigital number, since it uses as much as digits as its factorization.

121298917777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6223392, while the sum is 61.

The spelling of 121298917777 in words is "one hundred twenty-one billion, two hundred ninety-eight million, nine hundred seventeen thousand, seven hundred seventy-seven".