201201100100100 has 288 divisors, whose sum is σ = 659184814471680. Its totient is φ = 52628808960000.

The previous prime is 201201100100081. The next prime is 201201100100113. The reversal of 201201100100100 is 1001001102102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 611015500 + ... + 611344700.

It is an arithmetic number, because the mean of its divisors is an integer number (2288836161360).

Almost surely, 2^{201201100100100} is an apocalyptic number.

201201100100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201201100100100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329592407235840).

201201100100100 is an abundant number, since it is smaller than the sum of its proper divisors (457983714371580).

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

201201100100100 is a wasteful number, since it uses less digits than its factorization.

201201100100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333548 (or 333535 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 201201100100100 its reverse (1001001102102), we get a palindrome (202202101202202).

The spelling of 201201100100100 in words is "two hundred one trillion, two hundred one billion, one hundred million, one hundred thousand, one hundred".