121775229977 has 2 divisors, whose sum is σ = 121775229978. Its totient is φ = 121775229976.

The previous prime is 121775229941. The next prime is 121775230081. The reversal of 121775229977 is 779922577121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106602903001 + 15172326976 = 326501^2 + 123176^2 .

It is a cyclic number.

It is not a de Polignac number, because 121775229977 - 2⁸ = 121775229721 is a prime.

It is not a weakly prime, because it can be changed into another prime (121775229907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60887614988 + 60887614989.

It is an arithmetic number, because the mean of its divisors is an integer number (60887614989).

Almost surely, 2^121775229977 is an apocalyptic number.

It is an amenable number.

121775229977 is a deficient number, since it is larger than the sum of its proper divisors (1).

121775229977 is an equidigital number, since it uses as much as digits as its factorization.

121775229977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7779240, while the sum is 59.

The spelling of 121775229977 in words is "one hundred twenty-one billion, seven hundred seventy-five million, two hundred twenty-nine thousand, nine hundred seventy-seven".