201021211211212 has 144 divisors (see below), whose sum is σ = 420453952934400. Its totient is φ = 83828859206400.

The previous prime is 201021211211153. The next prime is 201021211211251. The reversal of 201021211211212 is 212112112120102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 201021211211212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 281486089 + ... + 282199327.

It is an arithmetic number, because the mean of its divisors is an integer number (2919819117600).

Almost surely, 2^{201021211211212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201021211211212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210226976467200).

201021211211212 is an abundant number, since it is smaller than the sum of its proper divisors (219432741723188).

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

201021211211212 is a wasteful number, since it uses less digits than its factorization.

201021211211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713604 (or 713595 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 201021211211212 its reverse (212112112120102), we get a palindrome (413133323331314).

The spelling of 201021211211212 in words is "two hundred one trillion, twenty-one billion, two hundred eleven million, two hundred eleven thousand, two hundred twelve".