201211122111012 has 36 divisors (see below), whose sum is σ = 547741387970140. Its totient is φ = 61911114495552.

The previous prime is 201211122110959. The next prime is 201211122111049. The reversal of 201211122111012 is 210111221112102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 79710898185216 + 121500223925796 = 8928096^2 + 11022714^2 .

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

It is a super-2 number, since 2×201211122111012² (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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214969147087 + ... + 214969148022.

Almost surely, 2^{201211122111012} is an apocalyptic number.

It is an amenable number.

201211122111012 is an abundant number, since it is smaller than the sum of its proper divisors (346530265859128).

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

201211122111012 is a wasteful number, since it uses less digits than its factorization.

201211122111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429938295132 (or 429938295127 counting only the distinct ones).

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

Adding to 201211122111012 its reverse (210111221112102), we get a palindrome (411322343223114).

The spelling of 201211122111012 in words is "two hundred one trillion, two hundred eleven billion, one hundred twenty-two million, one hundred eleven thousand, twelve".