20001100212100 has 72 divisors (see below), whose sum is σ = 51759368938368. Its totient is φ = 6559367020800.

The previous prime is 20001100212083. The next prime is 20001100212101. The reversal of 20001100212100 is 121200110002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (20001100212101) 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, 621136081 + ... + 621168280.

It is an arithmetic number, because the mean of its divisors is an integer number (718880124144).

Almost surely, 2^{20001100212100} is an apocalyptic number.

20001100212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001100212100 is an abundant number, since it is smaller than the sum of its proper divisors (31758268726268).

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

20001100212100 is a wasteful number, since it uses less digits than its factorization.

20001100212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242304405 (or 1242304398 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20001100212100 its reverse (121200110002), we get a palindrome (20122300322102).

The spelling of 20001100212100 in words is "twenty trillion, one billion, one hundred million, two hundred twelve thousand, one hundred".