201211111122012 has 18 divisors (see below), whose sum is σ = 508616975336288. Its totient is φ = 67070370373992.

The previous prime is 201211111121971. The next prime is 201211111122013. The reversal of 201211111122012 is 210221111112102.

It is a happy number.

201211111122012 is a `hidden beast` number, since 201 + 211 + 11 + 11 + 220 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×201211111122012² (a number of 29 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211111122013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2794598765548 + ... + 2794598765619.

Almost surely, 2^{201211111122012} is an apocalyptic number.

It is an amenable number.

201211111122012 is an abundant number, since it is smaller than the sum of its proper divisors (307405864214276).

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

201211111122012 is a wasteful number, since it uses less digits than its factorization.

201211111122012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5589197531177 (or 5589197531172 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 201211111122012 its reverse (210221111112102), we get a palindrome (411432222234114).

The spelling of 201211111122012 in words is "two hundred one trillion, two hundred eleven billion, one hundred eleven million, one hundred twenty-two thousand, twelve".