121221004939 has 2 divisors, whose sum is σ = 121221004940. Its totient is φ = 121221004938.

The previous prime is 121221004901. The next prime is 121221004943. The reversal of 121221004939 is 939400122121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121221004939 - 2¹¹ = 121221002891 is a prime.

It is not a weakly prime, because it can be changed into another prime (121221004999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610502469 + 60610502470.

It is an arithmetic number, because the mean of its divisors is an integer number (60610502470).

Almost surely, 2^121221004939 is an apocalyptic number.

121221004939 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221004939 is an equidigital number, since it uses as much as digits as its factorization.

121221004939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 121221004939 in words is "one hundred twenty-one billion, two hundred twenty-one million, four thousand, nine hundred thirty-nine".