1217779200000 has 1404 divisors, whose sum is σ = 4956133677768. Its totient is φ = 285696000000.

The previous prime is 1217779199983. The next prime is 1217779200007. The reversal of 1217779200000 is 29777121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217779200007) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 39283199985 + ... + 39283200015.

It is an arithmetic number, because the mean of its divisors is an integer number (3530009742).

Almost surely, 2^{1217779200000} is an apocalyptic number.

1217779200000 is a gapful number since it is divisible by the number (10) 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 1217779200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2478066838884).

1217779200000 is an abundant number, since it is smaller than the sum of its proper divisors (3738354477768).

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

1217779200000 is an frugal number, since it uses more digits than its factorization.

1217779200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 36.

The spelling of 1217779200000 in words is "one trillion, two hundred seventeen billion, seven hundred seventy-nine million, two hundred thousand".