121005561239 has 2 divisors, whose sum is σ = 121005561240. Its totient is φ = 121005561238.

The previous prime is 121005561227. The next prime is 121005561277. The reversal of 121005561239 is 932165500121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121005561239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121005561199 and 121005561208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121305561239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60502780619 + 60502780620.

It is an arithmetic number, because the mean of its divisors is an integer number (60502780620).

Almost surely, 2^121005561239 is an apocalyptic number.

121005561239 is a deficient number, since it is larger than the sum of its proper divisors (1).

121005561239 is an equidigital number, since it uses as much as digits as its factorization.

121005561239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The spelling of 121005561239 in words is "one hundred twenty-one billion, five million, five hundred sixty-one thousand, two hundred thirty-nine".