121010243209 has 2 divisors, whose sum is σ = 121010243210. Its totient is φ = 121010243208.

The previous prime is 121010243191. The next prime is 121010243213. The reversal of 121010243209 is 902342010121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120270240000 + 740003209 = 346800^2 + 27203^2 .

It is a cyclic number.

It is not a de Polignac number, because 121010243209 - 2⁵ = 121010243177 is a prime.

It is not a weakly prime, because it can be changed into another prime (121010243279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505121604 + 60505121605.

It is an arithmetic number, because the mean of its divisors is an integer number (60505121605).

Almost surely, 2^121010243209 is an apocalyptic number.

It is an amenable number.

121010243209 is a deficient number, since it is larger than the sum of its proper divisors (1).

121010243209 is an equidigital number, since it uses as much as digits as its factorization.

121010243209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 121010243209 in words is "one hundred twenty-one billion, ten million, two hundred forty-three thousand, two hundred nine".