121720546027 has 2 divisors, whose sum is σ = 121720546028. Its totient is φ = 121720546026.

The previous prime is 121720546001. The next prime is 121720546063. The reversal of 121720546027 is 720645027121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121720546027 - 2¹⁹ = 121720021739 is a prime.

It is a super-2 number, since 2×121720546027² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121720546327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60860273013 + 60860273014.

It is an arithmetic number, because the mean of its divisors is an integer number (60860273014).

Almost surely, 2^121720546027 is an apocalyptic number.

121720546027 is a deficient number, since it is larger than the sum of its proper divisors (1).

121720546027 is an equidigital number, since it uses as much as digits as its factorization.

121720546027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 121720546027 in words is "one hundred twenty-one billion, seven hundred twenty million, five hundred forty-six thousand, twenty-seven".