20000121221200 has 60 divisors (see below), whose sum is σ = 48161262300508. Its totient is φ = 7981572556800.

The previous prime is 20000121221191. The next prime is 20000121221233. The reversal of 20000121221200 is 212212100002.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3651813984784 + 16348307236416 = 1910972^2 + 4043304^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57563871 + ... + 57910270.

Almost surely, 2^{20000121221200} is an apocalyptic number.

20000121221200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20000121221200 is an abundant number, since it is smaller than the sum of its proper divisors (28161141079308).

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

20000121221200 is a wasteful number, since it uses less digits than its factorization.

20000121221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115474592 (or 115474581 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20000121221200 its reverse (212212100002), we get a palindrome (20212333321202).

The spelling of 20000121221200 in words is "twenty trillion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred".