673612021 has 2 divisors, whose sum is σ = 673612022. Its totient is φ = 673612020.

The previous prime is 673612013. The next prime is 673612031. The reversal of 673612021 is 120216376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657922500 + 15689521 = 25650^2 + 3961^2 .

It is a cyclic number.

It is not a de Polignac number, because 673612021 - 2³ = 673612013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673612031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336806010 + 336806011.

It is an arithmetic number, because the mean of its divisors is an integer number (336806011).

Almost surely, 2^673612021 is an apocalyptic number.

It is an amenable number.

673612021 is a deficient number, since it is larger than the sum of its proper divisors (1).

673612021 is an equidigital number, since it uses as much as digits as its factorization.

673612021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 673612021 is about 25954.0366995194. The cubic root of 673612021 is about 876.6036532912.

Adding to 673612021 its reverse (120216376), we get a palindrome (793828397).

The spelling of 673612021 in words is "six hundred seventy-three million, six hundred twelve thousand, twenty-one".