201212121121212 has 24 divisors (see below), whose sum is σ = 469594778236416. Its totient is φ = 67056445761328.

The previous prime is 201212121121169. The next prime is 201212121121229. The reversal of 201212121121212 is 212121121212102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1782601098 + ... + 1782713969.

It is an arithmetic number, because the mean of its divisors is an integer number (19566449093184).

Almost surely, 2^{201212121121212} is an apocalyptic number.

It is an amenable number.

201212121121212 is an abundant number, since it is smaller than the sum of its proper divisors (268382657115204).

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

201212121121212 is a wasteful number, since it uses less digits than its factorization.

201212121121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3565319777 (or 3565319775 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 201212121121212 its reverse (212121121212102), we get a palindrome (413333242333314).

The spelling of 201212121121212 in words is "two hundred one trillion, two hundred twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twelve".