673356122221 has 4 divisors (see below), whose sum is σ = 680297938012. Its totient is φ = 666414306432.

The previous prime is 673356122213. The next prime is 673356122249. The reversal of 673356122221 is 122221653376.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 180846918121 + 492509204100 = 425261^2 + 701790^2 .

It is a cyclic number.

It is not a de Polignac number, because 673356122221 - 2³ = 673356122213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673356122251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3470907750 + ... + 3470907943.

It is an arithmetic number, because the mean of its divisors is an integer number (170074484503).

Almost surely, 2^673356122221 is an apocalyptic number.

It is an amenable number.

673356122221 is a deficient number, since it is larger than the sum of its proper divisors (6941815791).

673356122221 is an equidigital number, since it uses as much as digits as its factorization.

673356122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6941815790.

The product of its digits is 181440, while the sum is 40.

Adding to 673356122221 its reverse (122221653376), we get a palindrome (795577775597).

The spelling of 673356122221 in words is "six hundred seventy-three billion, three hundred fifty-six million, one hundred twenty-two thousand, two hundred twenty-one".