21234175673 has 2 divisors, whose sum is σ = 21234175674. Its totient is φ = 21234175672.

The previous prime is 21234175639. The next prime is 21234175691. The reversal of 21234175673 is 37657143212.

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., 18585323584 + 2648852089 = 136328^2 + 51467^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234175673 - 2⁶ = 21234175609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21234175673.

It is not a weakly prime, because it can be changed into another prime (21234175693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617087836 + 10617087837.

It is an arithmetic number, because the mean of its divisors is an integer number (10617087837).

Almost surely, 2^21234175673 is an apocalyptic number.

It is an amenable number.

21234175673 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234175673 is an equidigital number, since it uses as much as digits as its factorization.

21234175673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 41.

The spelling of 21234175673 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-five thousand, six hundred seventy-three".