121636447812 has 144 divisors (see below), whose sum is σ = 337813519680. Its totient is φ = 36597369600.

The previous prime is 121636447799. The next prime is 121636447817. The reversal of 121636447812 is 218744636121.

121636447812 is a `hidden beast` number, since 1 + 2 + 1 + 636 + 4 + 4 + 7 + 8 + 1 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (121636447817) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 83713278 + ... + 83714730.

It is an arithmetic number, because the mean of its divisors is an integer number (2345927220).

Almost surely, 2^121636447812 is an apocalyptic number.

121636447812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121636447812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168906759840).

121636447812 is an abundant number, since it is smaller than the sum of its proper divisors (216177071868).

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

121636447812 is a wasteful number, since it uses less digits than its factorization.

121636447812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834 (or 2829 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The spelling of 121636447812 in words is "one hundred twenty-one billion, six hundred thirty-six million, four hundred forty-seven thousand, eight hundred twelve".