121220993 has 2 divisors, whose sum is σ = 121220994. Its totient is φ = 121220992.

The previous prime is 121220963. The next prime is 121221013. The reversal of 121220993 is 399022121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101445184 + 19775809 = 10072^2 + 4447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121220993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (121220903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610496 + 60610497.

It is an arithmetic number, because the mean of its divisors is an integer number (60610497).

Almost surely, 2^121220993 is an apocalyptic number.

It is an amenable number.

121220993 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220993 is an equidigital number, since it uses as much as digits as its factorization.

121220993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 121220993 is about 11010.0405539671. The cubic root of 121220993 is about 494.9096770884.

The spelling of 121220993 in words is "one hundred twenty-one million, two hundred twenty thousand, nine hundred ninety-three".