2121195826843 has 2 divisors, whose sum is σ = 2121195826844. Its totient is φ = 2121195826842.

The previous prime is 2121195826829. The next prime is 2121195826877. The reversal of 2121195826843 is 3486285911212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121195826843 - 2³³ = 2112605892251 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121195823843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060597913421 + 1060597913422.

It is an arithmetic number, because the mean of its divisors is an integer number (1060597913422).

Almost surely, 2^{2121195826843} is an apocalyptic number.

2121195826843 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121195826843 is an equidigital number, since it uses as much as digits as its factorization.

2121195826843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 52.

The spelling of 2121195826843 in words is "two trillion, one hundred twenty-one billion, one hundred ninety-five million, eight hundred twenty-six thousand, eight hundred forty-three".