201231211212 has 36 divisors (see below), whose sum is σ = 508726772736. Its totient is φ = 67069291680.

The previous prime is 201231211177. The next prime is 201231211213. The reversal of 201231211212 is 212112132102.

201231211212 is a `hidden beast` number, since 201 + 231 + 21 + 1 + 212 = 666.

201231211212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (201231211213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5068 + ... + 634419.

Almost surely, 2^201231211212 is an apocalyptic number.

It is an amenable number.

201231211212 is an abundant number, since it is smaller than the sum of its proper divisors (307495561524).

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

201231211212 is a wasteful number, since it uses less digits than its factorization.

201231211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648238 (or 648233 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 201231211212 its reverse (212112132102), we get a palindrome (413343343314).

The spelling of 201231211212 in words is "two hundred one billion, two hundred thirty-one million, two hundred eleven thousand, two hundred twelve".