20121220021100 has 36 divisors (see below), whose sum is σ = 47632415398008. Its totient is φ = 7316807280000.

The previous prime is 20121220021081. The next prime is 20121220021129. The reversal of 20121220021100 is 112002212102.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9146008001 + ... + 9146010200.

Almost surely, 2^{20121220021100} is an apocalyptic number.

20121220021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121220021100 is an abundant number, since it is smaller than the sum of its proper divisors (27511195376908).

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

20121220021100 is a wasteful number, since it uses less digits than its factorization.

20121220021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18292018226 (or 18292018219 counting only the distinct ones).

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

Adding to 20121220021100 its reverse (112002212102), we get a palindrome (20233222233202).

The spelling of 20121220021100 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty million, twenty-one thousand, one hundred".