1211111342340 has 48 divisors (see below), whose sum is σ = 3391168038720. Its totient is φ = 322957664640.

The previous prime is 1211111342323. The next prime is 1211111342369. The reversal of 1211111342340 is 432431111121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211111342340.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4598751 + ... + 4854969.

It is an arithmetic number, because the mean of its divisors is an integer number (70649334140).

Almost surely, 2^{1211111342340} is an apocalyptic number.

1211111342340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211111342340 is an abundant number, since it is smaller than the sum of its proper divisors (2180056696380).

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

1211111342340 is a wasteful number, since it uses less digits than its factorization.

1211111342340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335012 (or 335010 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 1211111342340 its reverse (432431111121), we get a palindrome (1643542453461).

The spelling of 1211111342340 in words is "one trillion, two hundred eleven billion, one hundred eleven million, three hundred forty-two thousand, three hundred forty".