1211992820000 has 240 divisors, whose sum is σ = 3132381067200. Its totient is φ = 460580736000.

The previous prime is 1211992819997. The next prime is 1211992820099. The reversal of 1211992820000 is 282991121.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 68531159 + ... + 68548841.

It is an arithmetic number, because the mean of its divisors is an integer number (13051587780).

Almost surely, 2^{1211992820000} is an apocalyptic number.

1211992820000 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 1211992820000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1566190533600).

1211992820000 is an abundant number, since it is smaller than the sum of its proper divisors (1920388247200).

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

1211992820000 is a wasteful number, since it uses less digits than its factorization.

1211992820000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17885 (or 17862 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 1211992820000 in words is "one trillion, two hundred eleven billion, nine hundred ninety-two million, eight hundred twenty thousand".