20121204100 has 36 divisors (see below), whose sum is σ = 45071504128. Its totient is φ = 7788852000.

The previous prime is 20121204071. The next prime is 20121204107. The reversal of 20121204100 is 140212102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20121204107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3242256 + ... + 3248455.

Almost surely, 2^20121204100 is an apocalyptic number.

20121204100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121204100 is an abundant number, since it is smaller than the sum of its proper divisors (24950300028).

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

20121204100 is a wasteful number, since it uses less digits than its factorization.

20121204100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6490756 (or 6490749 counting only the distinct ones).

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

Adding to 20121204100 its reverse (140212102), we get a palindrome (20261416202).

The spelling of 20121204100 in words is "twenty billion, one hundred twenty-one million, two hundred four thousand, one hundred".