121730127181220 has 24 divisors (see below), whose sum is σ = 255633806460984. Its totient is φ = 48691948133376.

The previous prime is 121730127181217. The next prime is 121730127181261. The reversal of 121730127181220 is 22181721037121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 54044228784484 + 67685898396736 = 7351478^2 + 8227144^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3682292 + ... + 16031828.

It is an arithmetic number, because the mean of its divisors is an integer number (10651408602541).

Almost surely, 2^{121730127181220} is an apocalyptic number.

121730127181220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121730127181220 is an abundant number, since it is smaller than the sum of its proper divisors (133903679279764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121730127181220 is a wasteful number, since it uses less digits than its factorization.

121730127181220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12842399 (or 12842397 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 38.

The spelling of 121730127181220 in words is "one hundred twenty-one trillion, seven hundred thirty billion, one hundred twenty-seven million, one hundred eighty-one thousand, two hundred twenty".