2121043204240 has 20 divisors (see below), whose sum is σ = 4931425450044. Its totient is φ = 848417281664.

The previous prime is 2121043204223. The next prime is 2121043204249. The reversal of 2121043204240 is 424023401212.

It can be written as a sum of positive squares in 2 ways, for example, as 656333300736 + 1464709903504 = 810144^2 + 1210252^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (2121043204249) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13256519947 + ... + 13256520106.

Almost surely, 2^{2121043204240} is an apocalyptic number.

2121043204240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121043204240 is an abundant number, since it is smaller than the sum of its proper divisors (2810382245804).

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

2121043204240 is a wasteful number, since it uses less digits than its factorization.

2121043204240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26513040066 (or 26513040060 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 2121043204240 its reverse (424023401212), we get a palindrome (2545066605452).

The spelling of 2121043204240 in words is "two trillion, one hundred twenty-one billion, forty-three million, two hundred four thousand, two hundred forty".