121220122019987 has 2 divisors, whose sum is σ = 121220122019988. Its totient is φ = 121220122019986.

The previous prime is 121220122019947. The next prime is 121220122020077. The reversal of 121220122019987 is 789910221022121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121220122019987 - 2⁶ = 121220122019923 is a prime.

It is not a weakly prime, because it can be changed into another prime (121220122019947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610061009993 + 60610061009994.

It is an arithmetic number, because the mean of its divisors is an integer number (60610061009994).

Almost surely, 2^{121220122019987} is an apocalyptic number.

121220122019987 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220122019987 is an equidigital number, since it uses as much as digits as its factorization.

121220122019987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 47.

The spelling of 121220122019987 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, nineteen thousand, nine hundred eighty-seven".