2129781134989 has 8 divisors (see below), whose sum is σ = 2187371638368. Its totient is φ = 2072192150160.

The previous prime is 2129781134891. The next prime is 2129781135011. The reversal of 2129781134989 is 9894311879212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2129781134989 - 2¹⁵ = 2129781102221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2129781134989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129781144989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2823894 + ... + 3497704.

It is an arithmetic number, because the mean of its divisors is an integer number (273421454796).

Almost surely, 2^{2129781134989} is an apocalyptic number.

It is an amenable number.

2129781134989 is a deficient number, since it is larger than the sum of its proper divisors (57590503379).

2129781134989 is an equidigital number, since it uses as much as digits as its factorization.

2129781134989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759275.

The product of its digits is 15676416, while the sum is 64.

The spelling of 2129781134989 in words is "two trillion, one hundred twenty-nine billion, seven hundred eighty-one million, one hundred thirty-four thousand, nine hundred eighty-nine".