121221102187 has 2 divisors, whose sum is σ = 121221102188. Its totient is φ = 121221102186.

The previous prime is 121221102161. The next prime is 121221102199. The reversal of 121221102187 is 781201122121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121221102187 - 2¹⁹ = 121220577899 is a prime.

It is not a weakly prime, because it can be changed into another prime (121221102487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610551093 + 60610551094.

It is an arithmetic number, because the mean of its divisors is an integer number (60610551094).

Almost surely, 2^121221102187 is an apocalyptic number.

121221102187 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221102187 is an equidigital number, since it uses as much as digits as its factorization.

121221102187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 28.

The spelling of 121221102187 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred eighty-seven".