121210118016389 has 2 divisors, whose sum is σ = 121210118016390. Its totient is φ = 121210118016388.

The previous prime is 121210118016373. The next prime is 121210118016409. The reversal of 121210118016389 is 983610811012121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64370807552164 + 56839310464225 = 8023142^2 + 7539185^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210118016389 - 2⁴ = 121210118016373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210118016359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605059008194 + 60605059008195.

It is an arithmetic number, because the mean of its divisors is an integer number (60605059008195).

Almost surely, 2^{121210118016389} is an apocalyptic number.

It is an amenable number.

121210118016389 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210118016389 is an equidigital number, since it uses as much as digits as its factorization.

121210118016389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 44.

The spelling of 121210118016389 in words is "one hundred twenty-one trillion, two hundred ten billion, one hundred eighteen million, sixteen thousand, three hundred eighty-nine".