121557008648239 has 2 divisors, whose sum is σ = 121557008648240. Its totient is φ = 121557008648238.

The previous prime is 121557008648219. The next prime is 121557008648261. The reversal of 121557008648239 is 932846800755121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121557008648239 - 2¹⁷ = 121557008517167 is a prime.

It is a super-2 number, since 2×121557008648239² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121557008648209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60778504324119 + 60778504324120.

It is an arithmetic number, because the mean of its divisors is an integer number (60778504324120).

It is a 1-persistent number, because it is pandigital, but 2⋅121557008648239 = 243114017296478 is not.

Almost surely, 2^{121557008648239} is an apocalyptic number.

121557008648239 is a deficient number, since it is larger than the sum of its proper divisors (1).

121557008648239 is an equidigital number, since it uses as much as digits as its factorization.

121557008648239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29030400, while the sum is 61.

The spelling of 121557008648239 in words is "one hundred twenty-one trillion, five hundred fifty-seven billion, eight million, six hundred forty-eight thousand, two hundred thirty-nine".