73173221 has 16 divisors (see below), whose sum is σ = 81744768. Its totient is φ = 64939200.

The previous prime is 73173203. The next prime is 73173251. The reversal of 73173221 is 12237137.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73173221 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 (73173251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111731 + ... + 112383.

It is an arithmetic number, because the mean of its divisors is an integer number (5109048).

Almost surely, 2^73173221 is an apocalyptic number.

It is an amenable number.

73173221 is a deficient number, since it is larger than the sum of its proper divisors (8571547).

73173221 is a wasteful number, since it uses less digits than its factorization.

73173221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892.

The product of its digits is 1764, while the sum is 26.

The square root of 73173221 is about 8554.1347312279. The cubic root of 73173221 is about 418.2642289765.

The spelling of 73173221 in words is "seventy-three million, one hundred seventy-three thousand, two hundred twenty-one".