1200002100000 has 576 divisors, whose sum is σ = 4350501550080. Its totient is φ = 287164800000.

The previous prime is 1200002099977. The next prime is 1200002100061. The reversal of 1200002100000 is 12000021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 260697699 + ... + 260702301.

It is an arithmetic number, because the mean of its divisors is an integer number (7552954080).

Almost surely, 2^{1200002100000} is an apocalyptic number.

1200002100000 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 1200002100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2175250775040).

1200002100000 is an abundant number, since it is smaller than the sum of its proper divisors (3150499450080).

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

1200002100000 is an equidigital number, since it uses as much as digits as its factorization.

1200002100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4731 (or 4703 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 1200002100000 its reverse (12000021), we get a palindrome (1200014100021).

1200002100000 divided by its reverse (12000021) gives a 5-th power (100000 = 10⁵).

The spelling of 1200002100000 in words is "one trillion, two hundred billion, two million, one hundred thousand".