121221002197 has 2 divisors, whose sum is σ = 121221002198. Its totient is φ = 121221002196.

The previous prime is 121221002131. The next prime is 121221002261. The reversal of 121221002197 is 791200122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94033609201 + 27187392996 = 306649^2 + 164886^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221002197 - 2⁷ = 121221002069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221002797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610501098 + 60610501099.

It is an arithmetic number, because the mean of its divisors is an integer number (60610501099).

Almost surely, 2^121221002197 is an apocalyptic number.

It is an amenable number.

121221002197 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221002197 is an equidigital number, since it uses as much as digits as its factorization.

121221002197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The spelling of 121221002197 in words is "one hundred twenty-one billion, two hundred twenty-one million, two thousand, one hundred ninety-seven".