201212001221100 has 36 divisors (see below), whose sum is σ = 582173390200584. Its totient is φ = 53656533658880.

The previous prime is 201212001221081. The next prime is 201212001221107. The reversal of 201212001221100 is 1122100212102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 201212001221100.

It is not an unprimeable number, because it can be changed into a prime (201212001221107) 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, 335353335069 + ... + 335353335668.

Almost surely, 2^{201212001221100} is an apocalyptic number.

201212001221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201212001221100 is an abundant number, since it is smaller than the sum of its proper divisors (380961388979484).

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

201212001221100 is a wasteful number, since it uses less digits than its factorization.

201212001221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670706670754 (or 670706670747 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201212001221100 its reverse (1122100212102), we get a palindrome (202334101433202).

The spelling of 201212001221100 in words is "two hundred one trillion, two hundred twelve billion, one million, two hundred twenty-one thousand, one hundred".