121918474449 has 12 divisors (see below), whose sum is σ = 176134606596. Its totient is φ = 81265070592.

The previous prime is 121918474429. The next prime is 121918474471. The reversal of 121918474449 is 944474819121.

121918474449 is a `hidden beast` number, since 1 + 2 + 19 + 184 + 7 + 4 + 449 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 114585635025 + 7332839424 = 338505^2 + 85632^2 .

It is not a de Polignac number, because 121918474449 - 2²³ = 121910085841 is a prime.

It is a super-4 number, since 4×121918474449⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 121918474395 and 121918474404.

It is not an unprimeable number, because it can be changed into a prime (121918474429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1103724 + ... + 1209149.

It is an arithmetic number, because the mean of its divisors is an integer number (14677883883).

Almost surely, 2^121918474449 is an apocalyptic number.

It is an amenable number.

121918474449 is a deficient number, since it is larger than the sum of its proper divisors (54216132147).

121918474449 is a wasteful number, since it uses less digits than its factorization.

121918474449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2318736 (or 2318733 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The spelling of 121918474449 in words is "one hundred twenty-one billion, nine hundred eighteen million, four hundred seventy-four thousand, four hundred forty-nine".