20200121002100 has 72 divisors (see below), whose sum is σ = 48357498052248. Its totient is φ = 7276591411200.

The previous prime is 20200121002043. The next prime is 20200121002133. The reversal of 20200121002100 is 120012100202.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 18063367010404 + 2136753991696 = 4250102^2 + 1461764^2 .

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, 189441269 + ... + 189547868.

Almost surely, 2^{20200121002100} is an apocalyptic number.

20200121002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20200121002100 is an abundant number, since it is smaller than the sum of its proper divisors (28157377050148).

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

20200121002100 is a wasteful number, since it uses less digits than its factorization.

20200121002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378989205 (or 378989198 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20200121002100 its reverse (120012100202), we get a palindrome (20320133102302).

The spelling of 20200121002100 in words is "twenty trillion, two hundred billion, one hundred twenty-one million, two thousand, one hundred".