20121200121100 has 72 divisors (see below), whose sum is σ = 47054606558960. Its totient is φ = 7424166516480.

The previous prime is 20121200121097. The next prime is 20121200121101. The reversal of 20121200121100 is 112100212102.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (20121200121101) 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, 3557922 + ... + 7273321.

Almost surely, 2^{20121200121100} is an apocalyptic number.

20121200121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121200121100 is an abundant number, since it is smaller than the sum of its proper divisors (26933406437860).

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

20121200121100 is a wasteful number, since it uses less digits than its factorization.

20121200121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10832699 (or 10832692 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20121200121100 its reverse (112100212102), we get a palindrome (20233300333202).

The spelling of 20121200121100 in words is "twenty trillion, one hundred twenty-one billion, two hundred million, one hundred twenty-one thousand, one hundred".