121001221987 has 2 divisors, whose sum is σ = 121001221988. Its totient is φ = 121001221986.

The previous prime is 121001221931. The next prime is 121001222029. The reversal of 121001221987 is 789122100121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121001221987 is a prime.

It is not a weakly prime, because it can be changed into another prime (121001221907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500610993 + 60500610994.

It is an arithmetic number, because the mean of its divisors is an integer number (60500610994).

Almost surely, 2^121001221987 is an apocalyptic number.

121001221987 is a deficient number, since it is larger than the sum of its proper divisors (1).

121001221987 is an equidigital number, since it uses as much as digits as its factorization.

121001221987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 121001221987 in words is "one hundred twenty-one billion, one million, two hundred twenty-one thousand, nine hundred eighty-seven".