1211411812 has 12 divisors (see below), whose sum is σ = 2283045436. Its totient is φ = 559113120.

The previous prime is 1211411801. The next prime is 1211411813. The reversal of 1211411812 is 2181141121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 309971236 + 901440576 = 17606^2 + 30024^2 .

It is a super-3 number, since 3×1211411812³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211411813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11648139 + ... + 11648242.

Almost surely, 2^1211411812 is an apocalyptic number.

It is an amenable number.

1211411812 is a deficient number, since it is larger than the sum of its proper divisors (1071633624).

1211411812 is a wasteful number, since it uses less digits than its factorization.

1211411812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23296398 (or 23296396 counting only the distinct ones).

The product of its digits is 128, while the sum is 22.

The square root of 1211411812 is about 34805.3417164665. The cubic root of 1211411812 is about 1066.0165192150.

Adding to 1211411812 its reverse (2181141121), we get a palindrome (3392552933).

The spelling of 1211411812 in words is "one billion, two hundred eleven million, four hundred eleven thousand, eight hundred twelve".