2120000021200 has 120 divisors (see below), whose sum is σ = 5494659812568. Its totient is φ = 783058698240.

The previous prime is 2120000021159. The next prime is 2120000021207. The reversal of 2120000021200 is 21200000212.

It can be written as a sum of positive squares in 12 ways, for example, as 32772585024 + 2087227436176 = 181032^2 + 1444724^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120000021207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2580777 + ... + 3301576.

Almost surely, 2^{2120000021200} is an apocalyptic number.

2120000021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2120000021200 is an abundant number, since it is smaller than the sum of its proper divisors (3374659791368).

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

2120000021200 is a wasteful number, since it uses less digits than its factorization.

2120000021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5882441 (or 5882430 counting only the distinct ones).

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

Adding to 2120000021200 its reverse (21200000212), we get a palindrome (2141200021412).

2120000021200 divided by its reverse (21200000212) gives a square (100 = 10²).

The spelling of 2120000021200 in words is "two trillion, one hundred twenty billion, twenty-one thousand, two hundred".