73206221 has 16 divisors (see below), whose sum is σ = 86784000. Its totient is φ = 61009200.

The previous prime is 73206187. The next prime is 73206227. The reversal of 73206221 is 12260237.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73206221 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 (73206227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 830 + ... + 12128.

It is an arithmetic number, because the mean of its divisors is an integer number (5424000).

Almost surely, 2^73206221 is an apocalyptic number.

It is an amenable number.

73206221 is a deficient number, since it is larger than the sum of its proper divisors (13577779).

73206221 is a wasteful number, since it uses less digits than its factorization.

73206221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11360.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 73206221 is about 8556.0634055622. The cubic root of 73206221 is about 418.3270964434.

Adding to 73206221 its reverse (12260237), we get a palindrome (85466458).

The spelling of 73206221 in words is "seventy-three million, two hundred six thousand, two hundred twenty-one".