121804345172 has 12 divisors (see below), whose sum is σ = 215552633940. Its totient is φ = 60217878336.

The previous prime is 121804345153. The next prime is 121804345181. The reversal of 121804345172 is 271543408121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22127752516 + 99676592656 = 148754^2 + 315716^2 .

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 171073163 + ... + 171073874.

It is an arithmetic number, because the mean of its divisors is an integer number (17962719495).

Almost surely, 2^121804345172 is an apocalyptic number.

It is an amenable number.

121804345172 is a deficient number, since it is larger than the sum of its proper divisors (93748288768).

121804345172 is a wasteful number, since it uses less digits than its factorization.

121804345172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342147130 (or 342147128 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 121804345172 in words is "one hundred twenty-one billion, eight hundred four million, three hundred forty-five thousand, one hundred seventy-two".