2121135673 has 2 divisors, whose sum is σ = 2121135674. Its totient is φ = 2121135672.

The previous prime is 2121135659. The next prime is 2121135683. The reversal of 2121135673 is 3765311212.

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., 1842813184 + 278322489 = 42928^2 + 16683^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121135673 - 2¹⁷ = 2121004601 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121135613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060567836 + 1060567837.

It is an arithmetic number, because the mean of its divisors is an integer number (1060567837).

Almost surely, 2^2121135673 is an apocalyptic number.

It is an amenable number.

2121135673 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121135673 is an equidigital number, since it uses as much as digits as its factorization.

2121135673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 2121135673 is about 46055.7887023987. The cubic root of 2121135673 is about 1284.8610069348.

Adding to 2121135673 its reverse (3765311212), we get a palindrome (5886446885).

The spelling of 2121135673 in words is "two billion, one hundred twenty-one million, one hundred thirty-five thousand, six hundred seventy-three".