1211122206 has 192 divisors, whose sum is σ = 3360913920. Its totient is φ = 319127040.

The previous prime is 1211122181. The next prime is 1211122207. The reversal of 1211122206 is 6022211121.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211122207) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2649930 + ... + 2650386.

It is an arithmetic number, because the mean of its divisors is an integer number (17504760).

Almost surely, 2^1211122206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211122206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1680456960).

1211122206 is an abundant number, since it is smaller than the sum of its proper divisors (2149791714).

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

1211122206 is a wasteful number, since it uses less digits than its factorization.

1211122206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541 (or 529 counting only the distinct ones).

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

The square root of 1211122206 is about 34801.1811006466. The cubic root of 1211122206 is about 1065.9315634133.

Adding to 1211122206 its reverse (6022211121), we get a palindrome (7233333327).

The spelling of 1211122206 in words is "one billion, two hundred eleven million, one hundred twenty-two thousand, two hundred six".