121551112235389 has 2 divisors, whose sum is σ = 121551112235390. Its totient is φ = 121551112235388.

The previous prime is 121551112235341. The next prime is 121551112235401. The reversal of 121551112235389 is 983532211155121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103118541372900 + 18432570862489 = 10154730^2 + 4293317^2 .

It is a cyclic number.

It is not a de Polignac number, because 121551112235389 - 2¹³ = 121551112227197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121551112235339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60775556117694 + 60775556117695.

It is an arithmetic number, because the mean of its divisors is an integer number (60775556117695).

Almost surely, 2^{121551112235389} is an apocalyptic number.

It is an amenable number.

121551112235389 is a deficient number, since it is larger than the sum of its proper divisors (1).

121551112235389 is an equidigital number, since it uses as much as digits as its factorization.

121551112235389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 49.

The spelling of 121551112235389 in words is "one hundred twenty-one trillion, five hundred fifty-one billion, one hundred twelve million, two hundred thirty-five thousand, three hundred eighty-nine".