2121768508441 has 4 divisors (see below), whose sum is σ = 2121886317412. Its totient is φ = 2121650699472.

The previous prime is 2121768508427. The next prime is 2121768508477. The reversal of 2121768508441 is 1448058671212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1306186123225 + 815582385216 = 1142885^2 + 903096^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121768508441 - 2¹³ = 2121768500249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121768508241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58877466 + ... + 58913491.

It is an arithmetic number, because the mean of its divisors is an integer number (530471579353).

Almost surely, 2^{2121768508441} is an apocalyptic number.

It is an amenable number.

2121768508441 is a deficient number, since it is larger than the sum of its proper divisors (117808971).

2121768508441 is a wasteful number, since it uses less digits than its factorization.

2121768508441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117808970.

The product of its (nonzero) digits is 860160, while the sum is 49.

The spelling of 2121768508441 in words is "two trillion, one hundred twenty-one billion, seven hundred sixty-eight million, five hundred eight thousand, four hundred forty-one".