1211340044020 has 24 divisors (see below), whose sum is σ = 2545316711784. Its totient is φ = 484249804416.

The previous prime is 1211340043987. The next prime is 1211340044029. The reversal of 1211340044020 is 204400431121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3811580644 + 1207528463376 = 61738^2 + 1098876^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1211340043982 and 1211340044000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211340044029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17853619 + ... + 17921338.

It is an arithmetic number, because the mean of its divisors is an integer number (106054862991).

Almost surely, 2^{1211340044020} is an apocalyptic number.

1211340044020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211340044020 is an abundant number, since it is smaller than the sum of its proper divisors (1333976667764).

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

1211340044020 is a wasteful number, since it uses less digits than its factorization.

1211340044020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35776659 (or 35776657 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 1211340044020 its reverse (204400431121), we get a palindrome (1415740475141).

The spelling of 1211340044020 in words is "one trillion, two hundred eleven billion, three hundred forty million, forty-four thousand, twenty".