121210220209987 has 2 divisors, whose sum is σ = 121210220209988. Its totient is φ = 121210220209986.

The previous prime is 121210220209951. The next prime is 121210220210021. The reversal of 121210220209987 is 789902022012121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121210220209987 is a prime.

It is not a weakly prime, because it can be changed into another prime (121210220209927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605110104993 + 60605110104994.

It is an arithmetic number, because the mean of its divisors is an integer number (60605110104994).

Almost surely, 2^{121210220209987} is an apocalyptic number.

121210220209987 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210220209987 is an equidigital number, since it uses as much as digits as its factorization.

121210220209987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 121210220209987 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred twenty million, two hundred nine thousand, nine hundred eighty-seven".