2135270681 has 2 divisors, whose sum is σ = 2135270682. Its totient is φ = 2135270680.

The previous prime is 2135270639. The next prime is 2135270689. The reversal of 2135270681 is 1860725312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1805485081 + 329785600 = 42491^2 + 18160^2 .

It is a cyclic number.

It is not a de Polignac number, because 2135270681 - 2¹⁰ = 2135269657 is a prime.

It is a super-2 number, since 2×2135270681² = 9118761762276407522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2135270689) 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 as a sum of consecutive naturals, namely, 1067635340 + 1067635341.

It is an arithmetic number, because the mean of its divisors is an integer number (1067635341).

Almost surely, 2^2135270681 is an apocalyptic number.

It is an amenable number.

2135270681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2135270681 is an equidigital number, since it uses as much as digits as its factorization.

2135270681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 2135270681 is about 46208.9891795958. The cubic root of 2135270681 is about 1287.7087466982.

Adding to 2135270681 its reverse (1860725312), we get a palindrome (3995995993).

The spelling of 2135270681 in words is "two billion, one hundred thirty-five million, two hundred seventy thousand, six hundred eighty-one".