2121002200000 has 168 divisors, whose sum is σ = 5264606793600. Its totient is φ = 847777920000.

The previous prime is 2121002199983. The next prime is 2121002200043. The reversal of 2121002200000 is 22001212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 2121002200000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351796986 + ... + 351803014.

It is an arithmetic number, because the mean of its divisors is an integer number (31336945200).

Almost surely, 2^{2121002200000} is an apocalyptic number.

2121002200000 is a gapful number since it is divisible by the number (20) 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 2121002200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2632303396800).

2121002200000 is an abundant number, since it is smaller than the sum of its proper divisors (3143604593600).

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

2121002200000 is an frugal number, since it uses more digits than its factorization.

2121002200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7825 (or 7795 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 2121002200000 its reverse (22001212), we get a palindrome (2121024201212).

The spelling of 2121002200000 in words is "two trillion, one hundred twenty-one billion, two million, two hundred thousand".