121210099987 has 2 divisors, whose sum is σ = 121210099988. Its totient is φ = 121210099986.

The previous prime is 121210099973. The next prime is 121210099999. The reversal of 121210099987 is 789990012121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121210099987 - 2¹⁵ = 121210067219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121210099987.

It is not a weakly prime, because it can be changed into another prime (121210094987) 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, 60605049993 + 60605049994.

It is an arithmetic number, because the mean of its divisors is an integer number (60605049994).

Almost surely, 2^121210099987 is an apocalyptic number.

121210099987 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210099987 is an equidigital number, since it uses as much as digits as its factorization.

121210099987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 49.

The spelling of 121210099987 in words is "one hundred twenty-one billion, two hundred ten million, ninety-nine thousand, nine hundred eighty-seven".