121478251869 has 48 divisors (see below), whose sum is σ = 192120692400. Its totient is φ = 73517875200.

The previous prime is 121478251861. The next prime is 121478251883. The reversal of 121478251869 is 968152874121.

121478251869 is a `hidden beast` number, since 1 + 2 + 1 + 47 + 82 + 518 + 6 + 9 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 12471305625 + 109006946244 = 111675^2 + 330162^2 .

It is not a de Polignac number, because 121478251869 - 2³ = 121478251861 is a prime.

It is a super-2 number, since 2×121478251869² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121478251861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1726237 + ... + 1795229.

It is an arithmetic number, because the mean of its divisors is an integer number (4002514425).

Almost surely, 2^121478251869 is an apocalyptic number.

It is an amenable number.

121478251869 is a deficient number, since it is larger than the sum of its proper divisors (70642440531).

121478251869 is a wasteful number, since it uses less digits than its factorization.

121478251869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69262 (or 69259 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 121478251869 in words is "one hundred twenty-one billion, four hundred seventy-eight million, two hundred fifty-one thousand, eight hundred sixty-nine".