1211340132 has 18 divisors (see below), whose sum is σ = 3061998758. Its totient is φ = 403780032.

The previous prime is 1211340131. The next prime is 1211340157. The reversal of 1211340132 is 2310431121.

It can be written as a sum of positive squares in only one way, i.e., 945193536 + 266146596 = 30744^2 + 16314^2 .

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

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 (1211340131) 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 5 ways as a sum of consecutive naturals, for example, 16824133 + ... + 16824204.

Almost surely, 2^1211340132 is an apocalyptic number.

1211340132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211340132 is an abundant number, since it is smaller than the sum of its proper divisors (1850658626).

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

1211340132 is a wasteful number, since it uses less digits than its factorization.

1211340132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33648347 (or 33648342 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1211340132 is about 34804.3119742368. The cubic root of 1211340132 is about 1065.9954931773.

Adding to 1211340132 its reverse (2310431121), we get a palindrome (3521771253).

The spelling of 1211340132 in words is "one billion, two hundred eleven million, three hundred forty thousand, one hundred thirty-two".