2133715681 has 6 divisors (see below), whose sum is σ = 2230519970. Its totient is φ = 2040944928.

The previous prime is 2133715669. The next prime is 2133715699. The reversal of 2133715681 is 1865173312.

It can be written as a sum of positive squares in only one way, i.e., 2116000000 + 17715681 = 46000^2 + 4209^2 .

It is not a de Polignac number, because 2133715681 - 2¹¹ = 2133713633 is a prime.

It is a super-2 number, since 2×2133715681² = 9105485214690587522, which contains 22 as substring.

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 2133715681.

It is not an unprimeable number, because it can be changed into a prime (2133715601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2016216 + ... + 2017273.

Almost surely, 2^2133715681 is an apocalyptic number.

It is an amenable number.

2133715681 is a deficient number, since it is larger than the sum of its proper divisors (96804289).

2133715681 is an equidigital number, since it uses as much as digits as its factorization.

2133715681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4033535 (or 4033512 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 2133715681 is about 46192.1603846367. The cubic root of 2133715681 is about 1287.3960816745.

Adding to 2133715681 its reverse (1865173312), we get a palindrome (3998888993).

The spelling of 2133715681 in words is "two billion, one hundred thirty-three million, seven hundred fifteen thousand, six hundred eighty-one".