20121120202100 has 18 divisors (see below), whose sum is σ = 43662830838774. Its totient is φ = 8048448080800.

The previous prime is 20121120202097. The next prime is 20121120202121. The reversal of 20121120202100 is 120202112102.

It can be written as a sum of positive squares in 3 ways, for example, as 25570568464 + 20095549633636 = 159908^2 + 4482806^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100605600911 + ... + 100605601110.

Almost surely, 2^{20121120202100} is an apocalyptic number.

20121120202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121120202100 is an abundant number, since it is smaller than the sum of its proper divisors (23541710636674).

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

20121120202100 is a wasteful number, since it uses less digits than its factorization.

20121120202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201211202035 (or 201211202028 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20121120202100 its reverse (120202112102), we get a palindrome (20241322314202).

The spelling of 20121120202100 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty million, two hundred two thousand, one hundred".