2113310578781 has 2 divisors, whose sum is σ = 2113310578782. Its totient is φ = 2113310578780.

The previous prime is 2113310578751. The next prime is 2113310578823. The reversal of 2113310578781 is 1878750133112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1144397155225 + 968913423556 = 1069765^2 + 984334^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113310578781 - 2¹⁰ = 2113310577757 is a prime.

It is a super-2 number, since 2×2113310578781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2113310578751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056655289390 + 1056655289391.

It is an arithmetic number, because the mean of its divisors is an integer number (1056655289391).

Almost surely, 2^{2113310578781} is an apocalyptic number.

It is an amenable number.

2113310578781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113310578781 is an equidigital number, since it uses as much as digits as its factorization.

2113310578781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 47.

The spelling of 2113310578781 in words is "two trillion, one hundred thirteen billion, three hundred ten million, five hundred seventy-eight thousand, seven hundred eighty-one".